How to get function parameter names using JS

This time I will show you how to use JS to get the function parameter name, what are the precautions for using JS to get the function parameter name, the following is a practical case, let’s take a look .

When I was browsing webhak.com, I saw a method that can get the function parameter name through javaScript. I thought it used regular expressions very cleverly. I read it and wrote it down first. Maybe it will be useful in the future. .

function getArgs(func){
		//匹配函数括号里的参数
		var args=func.toString().match(/function\s.*?\(([^)]*)\)/)[1];
		//分解参数成数组
		return args.split(",").map(function (arg){
			//去空格和内联注释
			return arg.replace(/\/\*.*\*\//,"").trim();
		}).filter(function(args) {
			//确保没有undefineds
			return args;
		});
	}

With this method, we can write a test function to test it.

function test(agr1,arg2,arg3){
		//这里是注释
		/*这里也是注释*/
	}
	console.log(getArgs(test));

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

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