获取函数名

如果当前函数是有名函数，则返回其名字，如果是匿名函数则返回被赋值的函数变量名，如果是闭包中匿名函数则返回“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：在要调查的函数内部执行此函数，传入一个参数，为arguments.callee。

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

<!doctype html>
<html dir="ltr" lang="zh-CN">
  <head>
    <meta charset="utf-8"/>
    <title>getFnName by 司徒正美</title>

hasname();
    //匿名函数（函数表达式）
    var noname = function(){
      //+++++++++++++++++++++++++++++++++
      var bb = getFnName(arguments.callee)
      //+++++++++++++++++++++++++++++++++
      alert(bb)
    };
    noname();
   //闭包
    (function(){
      //+++++++++++++++++++++++++++++++++
      var cc = getFnName(arguments.callee)
      //+++++++++++++++++++++++++++++++++
      alert(cc)
    })();
  }
    </script>
  </head>
  <body>
    <pre>
    //有名函数（函数定义）
    function hasname (){
      var aa = getFnName(arguments.callee)
      //+++++++++++++++++++++++++++++++++
      alert(aa)
    }

</body>
</html>