Detailed explanation of how to obtain function name and parameter method instance in javascript-JS Tutorial-php.cn

1. Three implementation methods for obtaining function names

Example 1:

A method seen in the js authoritative guide ：

Function.prototype.getName = function(){ return this.name || this.toString().match(/function\s*([^(]*)\(/)[1] }

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Example 2:

If the current function is a named function, its name is returned. If it is an anonymous function, the assigned function variable name is returned. If it is Anonymous functions in closures return "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" };

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Usage: Execute this function inside the function to be investigated, passing in one parameter, which is arguments.callee.

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

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Example 3:

function getFuncName(_callee) { var _text = _callee.toString(); var _scriptArr = document.scripts; for (var i=0; i<_scriptArr.length; i++) { var _start = _scriptArr[i].text.indexOf(_text); if (_start != -1) { if (/^function\s*\(.*\).*\r\n/.test(_text)) { var _tempArr = _scriptArr[i].text.substr(0, _start).split('\r\n'); return _tempArr[_tempArr.length - 1].replace(/(var)|(\s*)/g, '').replace(/=/g, ''); } else return _text.match(/^function\s*([^\(]+).*\r\n/)[1]; } } } function a() { return getFuncName(arguments.callee); } var b = function() { return getFuncName(arguments.callee); } window.alert(a()); window.alert(b());

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2. js method of obtaining all parameters of a function and traversing all attribute names and values of an object

1. Get all parameters

function test(){ for(var i=0;i
        
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2. Method to traverse all attribute names and values of an object

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