校验密码必须包含字母大小写、数字
function checkPasswordNew(s){
var str=trim(s);
	
	//var reg = /^(?![A-Z]+$)(?![a-z]+$)(?!\d+$)(?![\W_]+$)\S{8,20}$/;
	var reg = /^(?:(?=.*[A-Z])(?=.*[a-z])(?=.*[0-9])(?=.*[^A-Za-z0-9])).{8,20}$/;
	if(reg.test(str))
   	{
   		return true;
   	}
   	else
   	{
    	return false;
   	}
}

  

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