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Analysis on usage of function name .length attribute in Javascript (compared to arguments.length)

高洛峰Original: 2017-01-04 17:02:081806browse

The example of this article analyzes the usage of the function name.length attribute in Javascript. Share it with everyone for your reference, the details are as follows:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
  <title></title>
  <script type="text/javascript">
    //函数名.length表示的是函数定义的参数的个数,这里sayHi函数定义了一个参数a,所以输出1
    //和arguments.length不一样，arguments.length指的是外部调用时传入的形参的个数
    window.onload = function () {
      sayHi();
    }
    function sayHi(a) {
      alert(sayHi.length);  //打印出1
    }
    alert(sayHi.length);    //也是打印出1 
  </script>
</head>
<body>
</body>
</html>

I hope this article will be helpful to everyone’s JavaScript programming design.

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Analysis on usage of function name .length attribute in Javascript (compared to arguments.length)

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