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JavaScript參數個數可變的函數舉例說明，javascript可變
題外話：很早就接觸了JavaScript，但是沒有留意它，看到很多很酷、很炫的網頁，都有JavaScript的身影，Google在JavaScript的應用對我的影響最大了。我決心從頭開始學習它，所以有了JavaScript & Ajax這個分欄。我打算把這個分欄作為學習筆記記錄下來，因此每篇文章筆記可能很簡短，一兩句話註解而已。
JavaScript允許一個函數傳遞個數可變的參數，因為有arguments這個內建對象，它一個函數傳遞的所有參數的數組。舉個例子，就明白了。
複製代碼 代碼如下:
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JavaScript參數個數可變的函數</title>
<mce:script language="javascript" type="text/javascript"><!--
function testparams()
{
var params = "";
for (var i=0; i<arguments.length; i++) {
params = params + " " + arguments[i];
}
alert(params);
}
testparams("abc", 123);
testparams(123, "456", 789);
testparams();
// --></mce:script>
</head>
<body>
</body>
</html>
簡單的舉個例子。測試環境 win7+ie8+chrome
<script type="text/javascript">
function Add(x,y) {
alert(x + y);
}
function Sub(x,y) {
alert(x - y);
}
function CallFunc(Fun,x,y) {
if (Fun && (typeof Fun == "function")) {
if (x && y && (typeof x == "number") && (typeof y == "number")) {
Fun(x,y);
}else {
console.log(typeof x);
}
}else {
}
}
CallFunc(Sub,5,3);
</script>
javascript函數同名不同參數個數的定義
這樣，隨便你寫幾個參數
function myFunction()
{
// do something
alert(myFunction.length);
for(var i=0; i < myFunction.length; i++)
{
alert(myFunction.arguments[i]);
}
}
myFunction(1);
myFunction(1,2);
myFunction(1,2,3);
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