checkbox:
$(“#chk1”).attr(“checked”,”);//不打勾
$(“#chk2”).attr(“checked”,true);//打勾
if($(“#chk1”).attr(‘checked’)==undefined) //判断是否已经打勾
checkbox:
$(“#chk1”).attr(“checked”,”);//不打勾
$(“#chk2”).attr(“checked”,true);//打勾
if($(“#chk1”).attr(‘checked’)==undefined) //判断是否已经打勾

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