FormData用 jquery获取表单对象 或者用原生的js语法

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FormData用 jquery获取表单对象 或者用原生的js语法

$('#modal_form').validate({
	submitHandler: function(form) {
		var formobj =  document.getElementById("modal_form");    //用原生的js语法获取form表单dom
		// var formobj =  $("#modal_form").get(0);    //用 jquery获取form表单dom
		var res = new FormData(formobj);
		$.ajax({
			url: "<?php echo $this->config->app_url_root.'/Goods/ajax_add_brand'?>",
			type: "POST",
			dataType:"json",            
			data: res,
			cache: false,
			contentType: false,       //一定要写  
			processData: false,       //一定要写
			success: function(e) {
				e = JSON.parse(e);
				console.log(e);
			}
		});
		return false;
	},
	rules: {
		brand_name: "required",
		brand_desc: "required",
		site_url: {
			required: true,
			url: true
		}
	} 
});

图示：