更新前端静态网页获取方式，放弃使用后端获取api

frontend/node_modules/adjust-sourcemap-loader/codec/utility/get-output-directory.js

@@ -0,0 +1,22 @@
+'use strict';
+
+var path = require('path'),
+    fs   = require('fs');
+
+var getContextDirectory = require('./get-context-directory');
+
+/**
+ * Infer the compilation output directory from options.
+ * Relative paths are resolved against the compilation context (or process.cwd() where not specified).
+ * @this {{options: object}} A loader or compilation
+ * @returns {undefined|string} The output path string, where defined
+ */
+function getOutputDirectory() {
+  /* jshint validthis:true */
+  var base    = this.options && this.options.output ? this.options.output.directory : null,
+      absBase = !!base && path.resolve(getContextDirectory.call(this), base),
+      isValid = !!absBase && fs.existsSync(absBase) && fs.statSync(absBase).isDirectory();
+  return isValid ? absBase : undefined;
+}
+
+module.exports = getOutputDirectory;