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jquery 判断checkbox是否选中

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Release： 2016-06-01 09:54:48
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第一种方法：
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if ($("#checkbox-id").get(0).checked) { }
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第二种方法：
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if($('#checkbox-id').is(':checked')) { }
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第三种方法：
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if ($('#checkbox-id').attr('checked')) { }
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实例：

本实例获取所有checkbox的选中值。

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