擷取函數名

如果當前函數是有名函數，則返回其名字，如果是匿名函數則返回被賦值的函數變數名，如果是閉包中匿名函數則返回“anonymous”。

     var getFnName = function(callee){      var _callee = callee.toString().replace(/[\s\?]*/g,""),      comb = _callee.length >= 50 ? 50 :_callee.length;      _callee = _callee.substring(0,comb);      var name = _callee.match(/^function([^\(]+?)\(/);      if(name && name[1]){        return name[1];      }      var caller = callee.caller,      _caller = caller.toString().replace(/[\s\?]*/g,"");      var last = _caller.indexOf(_callee),      str = _caller.substring(last-30,last);      name = str.match(/var([^\=]+?)\=/);      if(name && name[1]){        return name[1];      }      return "anonymous"    };

使用：在要調查的函數內部執行此函數，傳入一個參數，為arguments.callee。

    function  ee(){      //+++++++++++++++++++++++++++++++++      var fnname =getFnName(arguments.callee)      //+++++++++++++++++++++++++++++++++      alert(fnname)    };    ee();

<meta charset="utf-8"><pre> //有名函數（函數定義） function hasname (){ var aa = getFnName(arguments.callee) //+++++++++++++++++++++++++++++++++ alert(aa) } hasname(); //匿名函數（函數運算式） var noname = function(){ //+++++++++++++++++++++++++++++++++ var bb = getFnName(arguments.callee) //+++++++++++++++++++++++++++++++++ alert(bb) }; noname(); //閉包 (function(){ //+++++++++++++++++++++++++++++++++ var cc = getFnName(arguments.callee) //+++++++++++++++++++++++++++++++++ alert(cc) })(); </pre><p>

運行代碼