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jquery is

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本来想写个判断语句，判断jquery对象是否可见，于是有：
if ($("p").visible()){...}
却得到错误:visible is not a function
网上找了找该怎么写这个判断语句， 发现可以用is()
于是上面的改写成：
if ($("p").is(":visible")){...}
就一切ok了

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