The parameters of JS functions can be obtained using the arguments object within the function.
There are two ways to call parameters:
1. Use of expected parameters.
2. Use of actual passed parameters.
Application example:
function Test(a, b){
var i, s = "Test函数有";
var numargs = arguments.length; // 获取实际被传递参数的数值。
var expargs = Test.length; // 获取期望参数的数值，函数定义时的预期参数个数（有a和b 2个参数）。
s += (expargs + "个参数。");
s += "\n\n"
for (i =0 ; i < numargs; i++){ // 获取参数内容。
s += " 第" + i + "个参数是：" + arguments[i] + "\n";
}
return(s); // 返回参数列表。
}
alert(Test('param1','second param','第三个参数'));It should be noted that:
arguments is an object object, it is not an array, and methods such as shift, push, and join cannot be used on it.
The i in arguments[i] used in the above example is only an attribute of the arguments object and cannot be understood as an array subscript.
Code Demonstration
<html>
<head>
<script language="javascript">
function reloadList(){
if(typeof arguments[0] == "function"){
arguments[0].call(this);
arguments[0]();
}
if(typeof arguments[0] == "string")
alert(arguments[0]);
if(typeof arguments[0] == "number")
alert(arguments[0]);
if(typeof arguments[0] == "undefined")
alert(arguments[0]);
if(typeof arguments[0] == "boolean")
alert(arguments[0]);
if(typeof arguments[0] == "null")
alert(arguments[0]);
}
reloadList(function(){});
</script>
</head>
<body>
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