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var now = new Date();
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var someDate = new Date(yyyy,mm,dd);
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2. ÈÕÆÚº¯ÊýµÄʹÓÿÉÒÔ²ÎÕÕÏÂÃæµÄÁ´½Ó. http://www.w3school.com.cn/js/jsref_obj_date.asp
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var someDate = new Date(yyyy, mm, 0); //ÕâÑùÊǵÚmm¸öÔµÄ×îºóÒ»Ìì
var days = someDate.getDate();
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