验证必输项

	function dovalidator() {
		var re = true;
		jQuery.each(jQuery("[required='true']"), function(c, v) {
			if (jQuery(v).val() == '' || jQuery(v).val() == null) {
				alert(jQuery(v).attr("label") + "必填!");
				jQuery(v).focus();
				re = false;
				return false;
			}
		});
		return re;
	}

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转载自1971161579.iteye.com/blog/2335137