prototype.js中
function $() {
var elements = new Array(); for (var i = 0; i < arguments.length; i++) {
var element = arguments[i];
if (typeof element == 'string')
element = document.getElementById(element); if (arguments.length == 1)
return element; elements.push(element);
} return elements;
}
在.jsp页面中调用$("id")来获取值是调这个方法吗?但是参数不匹配啊,不是调这个,我怎么找不到其他的,知道的解释下,谢谢了!
function $() {
var elements = new Array(); for (var i = 0; i < arguments.length; i++) {
var element = arguments[i];
if (typeof element == 'string')
element = document.getElementById(element); if (arguments.length == 1)
return element; elements.push(element);
} return elements;
}
在.jsp页面中调用$("id")来获取值是调这个方法吗?但是参数不匹配啊,不是调这个,我怎么找不到其他的,知道的解释下,谢谢了!
js用法如下:
<html>
<body>
<input type="text" id="test" value="testtest" />
<script>
function $() {
var elements = new Array(); for (var i = 0; i < arguments.length; i++) {
var element = arguments[i];
if (typeof element == 'string')
element = document.getElementById(element); if (arguments.length == 1)
return element; elements.push(element);
} return elements;
}
alert($("test").value); // testtest
</script>
</body>
</html>
$("id","xx") 得到 数组 arr = $("id","xx"); alert(arr[0]);
$() 得到 空数组 alert(arr.length);
id必须是response或者session里面的一个attribute
--prototype 获取对象函数function $(id)
{
return document.getElementById(id);
}
也可以写成多个参数$('ss1','ss2','ss3','ss4')
返回的是一个数组
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>xx</title>
<style type="text/css">
div { height:20px; width:400px; background-color:#003399; margin:5px; }
</style>
</head> <body>
<div id='ss1'>111111</div>
<div id='ss2'>222222</div>
<div id='ss3'>333333</div>
<div id='ss4'>444444</div>
<script>
function $() {
var elements = new Array();
for (var i = 0; i < arguments.length; i++) {
var element = arguments[i];
if (typeof element == 'string')
element = document.getElementById(element); if (arguments.length == 1)
return element;
elements.push(element);
}
return elements;
}
window.onload =function(){
for(var i=0;i<$('ss1','ss2','ss3','ss4').length;i++)
{
alert($('ss1','ss2','ss3','ss4')[i].innerHTML)
}
}
</script>
</body>
</html>
PS:JS函数调用不需要像Java那样去匹配参数? 直接按函数名调用,还是有其它的规则?