/*** 獲取函數(shù)名稱** @param {Function} func 函數(shù)引用* @return {String} 函數(shù)名稱*/function getFunctionName(func) {  if ( typeof func == 'function' || typeof func == 'object' ) {    var name = ('' + func).match(/function/s*([/w/$]*)/s*/(/);  }  return name && name[1];}if (!('console' in window)) {  window.console = {};}if (!console.trace) {  /**   * 顯示函數(shù)堆棧<br/>   * 為了和Firebug統(tǒng)一，將trace方法添加到console對(duì)象中   *   * @param {Function} func 函數(shù)引用   *   * @examplefunction a() {b();}function b() {c();}function c() {d();}function d() {console.trace();}a();   */  console.trace = function() {    var stack = [],      caller = arguments.callee.caller;    while (caller) {      stack.unshift(getFunctionName(caller));      caller = caller && caller.caller;    }    alert('functions on stack:' + '/n' + stack.join('/n'));  }};