chore: sync local changes (2026-03-12)
This commit is contained in:
@@ -1,190 +1,190 @@
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/* 背景样式文件 */
|
||||
|
||||
/* 主体背景 */
|
||||
body {
|
||||
background: linear-gradient(135deg, #e8f5e8 0%, #c8e6c9 50%, #a5d6a7 100%);
|
||||
background-attachment: fixed;
|
||||
background-size: 400% 400%;
|
||||
animation: gradientShift 15s ease infinite;
|
||||
}
|
||||
|
||||
/* 背景动画 */
|
||||
@keyframes gradientShift {
|
||||
0% {
|
||||
background-position: 0% 50%;
|
||||
}
|
||||
50% {
|
||||
background-position: 100% 50%;
|
||||
}
|
||||
100% {
|
||||
background-position: 0% 50%;
|
||||
}
|
||||
}
|
||||
|
||||
/* 装饰性背景元素 */
|
||||
body::before {
|
||||
content: '';
|
||||
position: fixed;
|
||||
top: 0;
|
||||
left: 0;
|
||||
width: 100%;
|
||||
height: 100%;
|
||||
background-image:
|
||||
radial-gradient(circle at 20% 80%, rgba(76, 175, 80, 0.1) 0%, transparent 50%),
|
||||
radial-gradient(circle at 80% 20%, rgba(129, 199, 132, 0.1) 0%, transparent 50%),
|
||||
radial-gradient(circle at 40% 40%, rgba(165, 214, 167, 0.08) 0%, transparent 50%);
|
||||
pointer-events: none;
|
||||
z-index: -1;
|
||||
}
|
||||
|
||||
/* 浮动装饰圆点 */
|
||||
body::after {
|
||||
content: '';
|
||||
position: fixed;
|
||||
top: 0;
|
||||
left: 0;
|
||||
width: 100%;
|
||||
height: 100%;
|
||||
background-image:
|
||||
radial-gradient(2px 2px at 20px 30px, rgba(76, 175, 80, 0.3), transparent),
|
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radial-gradient(2px 2px at 40px 70px, rgba(129, 199, 132, 0.2), transparent),
|
||||
radial-gradient(1px 1px at 90px 40px, rgba(165, 214, 167, 0.3), transparent),
|
||||
radial-gradient(1px 1px at 130px 80px, rgba(76, 175, 80, 0.2), transparent),
|
||||
radial-gradient(2px 2px at 160px 30px, rgba(129, 199, 132, 0.3), transparent);
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||||
background-repeat: repeat;
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||||
background-size: 200px 100px;
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||||
animation: float 20s linear infinite;
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||||
pointer-events: none;
|
||||
z-index: -1;
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||||
opacity: 0.6;
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||||
}
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||||
|
||||
@keyframes float {
|
||||
0% {
|
||||
transform: translateY(0px);
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||||
}
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||||
50% {
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||||
transform: translateY(-10px);
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||||
}
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||||
100% {
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transform: translateY(0px);
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||||
}
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||||
}
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/* 题目容器背景增强 */
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.question-container {
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background: rgba(255, 255, 255, 0.95);
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backdrop-filter: blur(10px);
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-webkit-backdrop-filter: blur(10px);
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||||
border: 1px solid rgba(255, 255, 255, 0.2);
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box-shadow:
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0 8px 32px rgba(26, 77, 26, 0.1),
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inset 0 1px 0 rgba(255, 255, 255, 0.2);
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}
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||||
/* 错误容器背景 */
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||||
.error-container {
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background: rgba(255, 255, 255, 0.95);
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backdrop-filter: blur(10px);
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-webkit-backdrop-filter: blur(10px);
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||||
}
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/* 结果容器背景 */
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.result-container {
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background: rgba(255, 255, 255, 0.9);
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backdrop-filter: blur(5px);
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||||
-webkit-backdrop-filter: blur(5px);
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||||
}
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||||
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||||
/* 代码块背景 */
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||||
.code-block {
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background: rgba(248, 249, 250, 0.9);
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backdrop-filter: blur(5px);
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-webkit-backdrop-filter: blur(5px);
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||||
}
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||||
/* 选项背景 */
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.option {
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background: rgba(255, 255, 255, 0.8);
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backdrop-filter: blur(5px);
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||||
-webkit-backdrop-filter: blur(5px);
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||||
}
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.option:hover {
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background: rgba(76, 175, 80, 0.05);
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}
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||||
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.option.selected {
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background: linear-gradient(135deg, rgba(76, 175, 80, 0.15), rgba(76, 175, 80, 0.08));
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}
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||||
|
||||
/* 按钮背景增强 */
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||||
.submit-btn {
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||||
background: linear-gradient(135deg, #4caf50, #45a049);
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||||
box-shadow: 0 4px 15px rgba(76, 175, 80, 0.2);
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||||
}
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||||
|
||||
.show-answer-btn {
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||||
background: linear-gradient(135deg, #2196f3, #1976d2);
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||||
box-shadow: 0 4px 15px rgba(33, 150, 243, 0.2);
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||||
}
|
||||
|
||||
.retry-btn {
|
||||
background: linear-gradient(135deg, #ff9800, #f57c00);
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||||
box-shadow: 0 4px 15px rgba(255, 152, 0, 0.2);
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||||
}
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||||
|
||||
.refresh-btn {
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||||
background: linear-gradient(135deg, #4caf50, #45a049);
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||||
box-shadow: 0 4px 15px rgba(76, 175, 80, 0.2);
|
||||
}
|
||||
|
||||
/* 移动端背景优化 */
|
||||
@media (max-width: 768px) {
|
||||
body {
|
||||
background-attachment: scroll;
|
||||
}
|
||||
|
||||
body::after {
|
||||
opacity: 0.4;
|
||||
background-size: 150px 75px;
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||||
}
|
||||
|
||||
.question-container {
|
||||
backdrop-filter: blur(8px);
|
||||
-webkit-backdrop-filter: blur(8px);
|
||||
}
|
||||
}
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||||
|
||||
/* 高对比度模式支持 */
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||||
@media (prefers-contrast: high) {
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||||
body {
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||||
background: #f0f8f0;
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||||
}
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||||
|
||||
body::before,
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||||
body::after {
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||||
display: none;
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||||
}
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||||
|
||||
.question-container {
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||||
background: #ffffff;
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||||
border: 2px solid #4caf50;
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||||
}
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||||
}
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||||
|
||||
/* 减少动画模式支持 */
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||||
@media (prefers-reduced-motion: reduce) {
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||||
body {
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||||
animation: none;
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||||
background: #e8f5e8;
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||||
}
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||||
|
||||
body::after {
|
||||
animation: none;
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||||
}
|
||||
|
||||
.refresh-btn:hover {
|
||||
transform: scale(1.1);
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||||
}
|
||||
/* 背景样式文件 */
|
||||
|
||||
/* 主体背景 */
|
||||
body {
|
||||
background: linear-gradient(135deg, #e8f5e8 0%, #c8e6c9 50%, #a5d6a7 100%);
|
||||
background-attachment: fixed;
|
||||
background-size: 400% 400%;
|
||||
animation: gradientShift 15s ease infinite;
|
||||
}
|
||||
|
||||
/* 背景动画 */
|
||||
@keyframes gradientShift {
|
||||
0% {
|
||||
background-position: 0% 50%;
|
||||
}
|
||||
50% {
|
||||
background-position: 100% 50%;
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||||
}
|
||||
100% {
|
||||
background-position: 0% 50%;
|
||||
}
|
||||
}
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||||
|
||||
/* 装饰性背景元素 */
|
||||
body::before {
|
||||
content: '';
|
||||
position: fixed;
|
||||
top: 0;
|
||||
left: 0;
|
||||
width: 100%;
|
||||
height: 100%;
|
||||
background-image:
|
||||
radial-gradient(circle at 20% 80%, rgba(76, 175, 80, 0.1) 0%, transparent 50%),
|
||||
radial-gradient(circle at 80% 20%, rgba(129, 199, 132, 0.1) 0%, transparent 50%),
|
||||
radial-gradient(circle at 40% 40%, rgba(165, 214, 167, 0.08) 0%, transparent 50%);
|
||||
pointer-events: none;
|
||||
z-index: -1;
|
||||
}
|
||||
|
||||
/* 浮动装饰圆点 */
|
||||
body::after {
|
||||
content: '';
|
||||
position: fixed;
|
||||
top: 0;
|
||||
left: 0;
|
||||
width: 100%;
|
||||
height: 100%;
|
||||
background-image:
|
||||
radial-gradient(2px 2px at 20px 30px, rgba(76, 175, 80, 0.3), transparent),
|
||||
radial-gradient(2px 2px at 40px 70px, rgba(129, 199, 132, 0.2), transparent),
|
||||
radial-gradient(1px 1px at 90px 40px, rgba(165, 214, 167, 0.3), transparent),
|
||||
radial-gradient(1px 1px at 130px 80px, rgba(76, 175, 80, 0.2), transparent),
|
||||
radial-gradient(2px 2px at 160px 30px, rgba(129, 199, 132, 0.3), transparent);
|
||||
background-repeat: repeat;
|
||||
background-size: 200px 100px;
|
||||
animation: float 20s linear infinite;
|
||||
pointer-events: none;
|
||||
z-index: -1;
|
||||
opacity: 0.6;
|
||||
}
|
||||
|
||||
@keyframes float {
|
||||
0% {
|
||||
transform: translateY(0px);
|
||||
}
|
||||
50% {
|
||||
transform: translateY(-10px);
|
||||
}
|
||||
100% {
|
||||
transform: translateY(0px);
|
||||
}
|
||||
}
|
||||
|
||||
/* 题目容器背景增强 */
|
||||
.question-container {
|
||||
background: rgba(255, 255, 255, 0.95);
|
||||
backdrop-filter: blur(10px);
|
||||
-webkit-backdrop-filter: blur(10px);
|
||||
border: 1px solid rgba(255, 255, 255, 0.2);
|
||||
box-shadow:
|
||||
0 8px 32px rgba(26, 77, 26, 0.1),
|
||||
inset 0 1px 0 rgba(255, 255, 255, 0.2);
|
||||
}
|
||||
|
||||
/* 错误容器背景 */
|
||||
.error-container {
|
||||
background: rgba(255, 255, 255, 0.95);
|
||||
backdrop-filter: blur(10px);
|
||||
-webkit-backdrop-filter: blur(10px);
|
||||
}
|
||||
|
||||
/* 结果容器背景 */
|
||||
.result-container {
|
||||
background: rgba(255, 255, 255, 0.9);
|
||||
backdrop-filter: blur(5px);
|
||||
-webkit-backdrop-filter: blur(5px);
|
||||
}
|
||||
|
||||
/* 代码块背景 */
|
||||
.code-block {
|
||||
background: rgba(248, 249, 250, 0.9);
|
||||
backdrop-filter: blur(5px);
|
||||
-webkit-backdrop-filter: blur(5px);
|
||||
}
|
||||
|
||||
/* 选项背景 */
|
||||
.option {
|
||||
background: rgba(255, 255, 255, 0.8);
|
||||
backdrop-filter: blur(5px);
|
||||
-webkit-backdrop-filter: blur(5px);
|
||||
}
|
||||
|
||||
.option:hover {
|
||||
background: rgba(76, 175, 80, 0.05);
|
||||
}
|
||||
|
||||
.option.selected {
|
||||
background: linear-gradient(135deg, rgba(76, 175, 80, 0.15), rgba(76, 175, 80, 0.08));
|
||||
}
|
||||
|
||||
/* 按钮背景增强 */
|
||||
.submit-btn {
|
||||
background: linear-gradient(135deg, #4caf50, #45a049);
|
||||
box-shadow: 0 4px 15px rgba(76, 175, 80, 0.2);
|
||||
}
|
||||
|
||||
.show-answer-btn {
|
||||
background: linear-gradient(135deg, #2196f3, #1976d2);
|
||||
box-shadow: 0 4px 15px rgba(33, 150, 243, 0.2);
|
||||
}
|
||||
|
||||
.retry-btn {
|
||||
background: linear-gradient(135deg, #ff9800, #f57c00);
|
||||
box-shadow: 0 4px 15px rgba(255, 152, 0, 0.2);
|
||||
}
|
||||
|
||||
.refresh-btn {
|
||||
background: linear-gradient(135deg, #4caf50, #45a049);
|
||||
box-shadow: 0 4px 15px rgba(76, 175, 80, 0.2);
|
||||
}
|
||||
|
||||
/* 移动端背景优化 */
|
||||
@media (max-width: 768px) {
|
||||
body {
|
||||
background-attachment: scroll;
|
||||
}
|
||||
|
||||
body::after {
|
||||
opacity: 0.4;
|
||||
background-size: 150px 75px;
|
||||
}
|
||||
|
||||
.question-container {
|
||||
backdrop-filter: blur(8px);
|
||||
-webkit-backdrop-filter: blur(8px);
|
||||
}
|
||||
}
|
||||
|
||||
/* 高对比度模式支持 */
|
||||
@media (prefers-contrast: high) {
|
||||
body {
|
||||
background: #f0f8f0;
|
||||
}
|
||||
|
||||
body::before,
|
||||
body::after {
|
||||
display: none;
|
||||
}
|
||||
|
||||
.question-container {
|
||||
background: #ffffff;
|
||||
border: 2px solid #4caf50;
|
||||
}
|
||||
}
|
||||
|
||||
/* 减少动画模式支持 */
|
||||
@media (prefers-reduced-motion: reduce) {
|
||||
body {
|
||||
animation: none;
|
||||
background: #e8f5e8;
|
||||
}
|
||||
|
||||
body::after {
|
||||
animation: none;
|
||||
}
|
||||
|
||||
.refresh-btn:hover {
|
||||
transform: scale(1.1);
|
||||
}
|
||||
}
|
||||
File diff suppressed because it is too large
Load Diff
@@ -1,91 +1,91 @@
|
||||
<!DOCTYPE html>
|
||||
<html lang="zh-CN">
|
||||
<head>
|
||||
<meta charset="UTF-8">
|
||||
<meta name="viewport" content="width=device-width, initial-scale=1.0">
|
||||
<title>随机JavaScript趣味题</title>
|
||||
<link rel="preconnect" href="https://cdnjs.cloudflare.com">
|
||||
<link rel="dns-prefetch" href="https://60s.api.shumengya.top">
|
||||
<link rel="stylesheet" href="css/style.css">
|
||||
<link rel="stylesheet" href="css/background.css">
|
||||
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/styles/github.min.css">
|
||||
<script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/highlight.min.js"></script>
|
||||
<script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/languages/javascript.min.js"></script>
|
||||
</head>
|
||||
<body>
|
||||
<div class="container">
|
||||
<header class="header">
|
||||
<h1>JavaScript趣味题</h1>
|
||||
<p class="subtitle">测试你的JavaScript知识</p>
|
||||
</header>
|
||||
|
||||
<main class="main-content">
|
||||
<div class="loading" id="loading">
|
||||
<div class="spinner"></div>
|
||||
<p>正在加载题目...</p>
|
||||
</div>
|
||||
|
||||
<div class="question-container" id="questionContainer" style="display: none;">
|
||||
<div class="question-header">
|
||||
<span class="question-id" id="questionId">题目 #1</span>
|
||||
<button class="refresh-btn" id="refreshBtn" title="获取新题目">
|
||||
<svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
|
||||
<polyline points="23 4 23 10 17 10"></polyline>
|
||||
<polyline points="1 20 1 14 7 14"></polyline>
|
||||
<path d="M20.49 9A9 9 0 0 0 5.64 5.64L1 10m22 4l-4.64 4.36A9 9 0 0 1 3.51 15"></path>
|
||||
</svg>
|
||||
</button>
|
||||
</div>
|
||||
|
||||
<div class="question-text" id="questionText">
|
||||
<h2>输出是什么？</h2>
|
||||
</div>
|
||||
|
||||
<div class="code-block" id="codeBlock">
|
||||
<pre><code id="codeContent" class="language-javascript"></code></pre>
|
||||
</div>
|
||||
|
||||
<div class="options-container" id="optionsContainer">
|
||||
<!-- 选项将通过JavaScript动态生成 -->
|
||||
</div>
|
||||
|
||||
<div class="action-buttons">
|
||||
<button class="submit-btn" id="submitBtn" disabled>提交答案</button>
|
||||
<button class="show-answer-btn" id="showAnswerBtn">查看答案</button>
|
||||
<button class="export-btn" id="exportBtn" title="导出为Markdown文件">
|
||||
<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
|
||||
<path d="M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4"></path>
|
||||
<polyline points="7 10 12 15 17 10"></polyline>
|
||||
<line x1="12" y1="15" x2="12" y2="3"></line>
|
||||
</svg>
|
||||
导出MD
|
||||
</button>
|
||||
</div>
|
||||
|
||||
<div class="result-container" id="resultContainer" style="display: none;">
|
||||
<div class="result-header">
|
||||
<span class="result-status" id="resultStatus"></span>
|
||||
<span class="correct-answer" id="correctAnswer"></span>
|
||||
</div>
|
||||
<div class="explanation" id="explanation">
|
||||
<!-- 解析内容 -->
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
|
||||
<div class="error-container" id="errorContainer" style="display: none;">
|
||||
<div class="error-icon">⚠️</div>
|
||||
<h3>加载失败</h3>
|
||||
<p id="errorMessage">网络连接异常，请稍后重试</p>
|
||||
<button class="retry-btn" id="retryBtn">重新加载</button>
|
||||
</div>
|
||||
</main>
|
||||
|
||||
<footer class="footer">
|
||||
<p>JavaScript趣味题集合</p>
|
||||
</footer>
|
||||
</div>
|
||||
|
||||
<script src="js/script.js"></script>
|
||||
</body>
|
||||
<!DOCTYPE html>
|
||||
<html lang="zh-CN">
|
||||
<head>
|
||||
<meta charset="UTF-8">
|
||||
<meta name="viewport" content="width=device-width, initial-scale=1.0">
|
||||
<title>随机JavaScript趣味题</title>
|
||||
<link rel="preconnect" href="https://cdnjs.cloudflare.com">
|
||||
<link rel="dns-prefetch" href="https://60s.api.shumengya.top">
|
||||
<link rel="stylesheet" href="css/style.css">
|
||||
<link rel="stylesheet" href="css/background.css">
|
||||
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/styles/github.min.css">
|
||||
<script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/highlight.min.js"></script>
|
||||
<script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/languages/javascript.min.js"></script>
|
||||
</head>
|
||||
<body>
|
||||
<div class="container">
|
||||
<header class="header">
|
||||
<h1>JavaScript趣味题</h1>
|
||||
<p class="subtitle">测试你的JavaScript知识</p>
|
||||
</header>
|
||||
|
||||
<main class="main-content">
|
||||
<div class="loading" id="loading">
|
||||
<div class="spinner"></div>
|
||||
<p>正在加载题目...</p>
|
||||
</div>
|
||||
|
||||
<div class="question-container" id="questionContainer" style="display: none;">
|
||||
<div class="question-header">
|
||||
<span class="question-id" id="questionId">题目 #1</span>
|
||||
<button class="refresh-btn" id="refreshBtn" title="获取新题目">
|
||||
<svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
|
||||
<polyline points="23 4 23 10 17 10"></polyline>
|
||||
<polyline points="1 20 1 14 7 14"></polyline>
|
||||
<path d="M20.49 9A9 9 0 0 0 5.64 5.64L1 10m22 4l-4.64 4.36A9 9 0 0 1 3.51 15"></path>
|
||||
</svg>
|
||||
</button>
|
||||
</div>
|
||||
|
||||
<div class="question-text" id="questionText">
|
||||
<h2>输出是什么？</h2>
|
||||
</div>
|
||||
|
||||
<div class="code-block" id="codeBlock">
|
||||
<pre><code id="codeContent" class="language-javascript"></code></pre>
|
||||
</div>
|
||||
|
||||
<div class="options-container" id="optionsContainer">
|
||||
<!-- 选项将通过JavaScript动态生成 -->
|
||||
</div>
|
||||
|
||||
<div class="action-buttons">
|
||||
<button class="submit-btn" id="submitBtn" disabled>提交答案</button>
|
||||
<button class="show-answer-btn" id="showAnswerBtn">查看答案</button>
|
||||
<button class="export-btn" id="exportBtn" title="导出为Markdown文件">
|
||||
<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
|
||||
<path d="M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4"></path>
|
||||
<polyline points="7 10 12 15 17 10"></polyline>
|
||||
<line x1="12" y1="15" x2="12" y2="3"></line>
|
||||
</svg>
|
||||
导出MD
|
||||
</button>
|
||||
</div>
|
||||
|
||||
<div class="result-container" id="resultContainer" style="display: none;">
|
||||
<div class="result-header">
|
||||
<span class="result-status" id="resultStatus"></span>
|
||||
<span class="correct-answer" id="correctAnswer"></span>
|
||||
</div>
|
||||
<div class="explanation" id="explanation">
|
||||
<!-- 解析内容 -->
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
|
||||
<div class="error-container" id="errorContainer" style="display: none;">
|
||||
<div class="error-icon">⚠️</div>
|
||||
<h3>加载失败</h3>
|
||||
<p id="errorMessage">网络连接异常，请稍后重试</p>
|
||||
<button class="retry-btn" id="retryBtn">重新加载</button>
|
||||
</div>
|
||||
</main>
|
||||
|
||||
<footer class="footer">
|
||||
<p>JavaScript趣味题集合</p>
|
||||
</footer>
|
||||
</div>
|
||||
|
||||
<script src="js/script.js"></script>
|
||||
</body>
|
||||
</html>
|
||||
File diff suppressed because it is too large
Load Diff
@@ -1,3 +1,3 @@
|
||||
[
|
||||
"https://60s.api.shumengya.top"
|
||||
]
|
||||
[
|
||||
"https://60s.api.shumengya.top"
|
||||
]
|
||||
|
||||
@@ -1,17 +1,17 @@
|
||||
{
|
||||
"code": 200,
|
||||
"message": "获取成功。数据来自官方/权威源头，以确保稳定与实时。开源地址 https://github.com/vikiboss/60s，反馈群 595941841",
|
||||
"data": {
|
||||
"id": 11,
|
||||
"question": "输出是什么？",
|
||||
"code": "function Person(firstName, lastName) {\n this.firstName = firstName;\n this.lastName = lastName;\n}\n\nconst member = new Person(\"Lydia\", \"Hallie\");\nPerson.getFullName = function () {\n return `${this.firstName} ${this.lastName}`;\n}\n\nconsole.log(member.getFullName());",
|
||||
"options": [
|
||||
"A: `TypeError`",
|
||||
"B: `SyntaxError`",
|
||||
"C: `Lydia Hallie`",
|
||||
"D: `undefined` `undefined`"
|
||||
],
|
||||
"answer": "A",
|
||||
"explanation": "你不能像常规对象那样，给构造函数添加属性。如果你想一次性给所有实例添加特性，你应该使用原型。因此本例中，使用如下方式：\n\n```js\nPerson.prototype.getFullName = function () {\n return `${this.firstName} ${this.lastName}`;\n}\n```\n\n这才会使 `member.getFullName()` 起作用。为什么这么做有益的？假设我们将这个方法添加到构造函数本身里。也许不是每个 `Person` 实例都需要这个方法。这将浪费大量内存空间，因为它们仍然具有该属性，这将占用每个实例的内存空间。相反，如果我们只将它添加到原型中，那么它只存在于内存中的一个位置，但是所有实例都可以访问它！"
|
||||
}
|
||||
{
|
||||
"code": 200,
|
||||
"message": "获取成功。数据来自官方/权威源头，以确保稳定与实时。开源地址 https://github.com/vikiboss/60s，反馈群 595941841",
|
||||
"data": {
|
||||
"id": 11,
|
||||
"question": "输出是什么？",
|
||||
"code": "function Person(firstName, lastName) {\n this.firstName = firstName;\n this.lastName = lastName;\n}\n\nconst member = new Person(\"Lydia\", \"Hallie\");\nPerson.getFullName = function () {\n return `${this.firstName} ${this.lastName}`;\n}\n\nconsole.log(member.getFullName());",
|
||||
"options": [
|
||||
"A: `TypeError`",
|
||||
"B: `SyntaxError`",
|
||||
"C: `Lydia Hallie`",
|
||||
"D: `undefined` `undefined`"
|
||||
],
|
||||
"answer": "A",
|
||||
"explanation": "你不能像常规对象那样，给构造函数添加属性。如果你想一次性给所有实例添加特性，你应该使用原型。因此本例中，使用如下方式：\n\n```js\nPerson.prototype.getFullName = function () {\n return `${this.firstName} ${this.lastName}`;\n}\n```\n\n这才会使 `member.getFullName()` 起作用。为什么这么做有益的？假设我们将这个方法添加到构造函数本身里。也许不是每个 `Person` 实例都需要这个方法。这将浪费大量内存空间，因为它们仍然具有该属性，这将占用每个实例的内存空间。相反，如果我们只将它添加到原型中，那么它只存在于内存中的一个位置，但是所有实例都可以访问它！"
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user