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jquery attr方法获取input的checked属性问题_jquery

WBOY
Release： 2016-05-16 16:47:03
Original
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问题：经常使用jQuery插件的attr方法获取checked属性值，获取的值的大小为未定义，此时可以用prop方法获取其真实值，下面介绍这两种方法的区别：

1.通过prop方法获取checked属性，获取的checked返回值为boolean，选中为true,否则为flase

复制代码 代码如下:

全选
function checkAll()
{
var checkedOfAll=$("#selectAll").prop("checked");
alert(checkedOfAll);
$("input[name='procheck']").prop("checked", checkedOfAll);
}

2.如果使用attr方法获取时，如果当前input中初始化未定义checked属性，则不管当前是否选中，$("#selectAll").attr("checked")都会返回undefined；
复制代码 代码如下:

全选

如果当前input中初始化已定义checked属性，则不管是否选中，$("#selectAll").attr("checked")都会返回checked.
复制代码 代码如下:

全选
function checkAll()
{
var checkedOfAll=$("#selectAll").attr("checked");
alert(checkedOfAll);
$("input[name='procheck']").attr("checked", checkedOfAll);
}

总结，如果使用jquery,应使用prop方法来获取和设置checked属性，不应使用attr.
Related labels：
input jquery
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