前端formData用法

声明

var formData = {};

var formData = new FormData();

赋值

 var optionItems = jQuery('#allotroomsrecordForm select');
 for (var i = 0; i < optionItems.length; i++) {
     formData[optionItems[i].name] = optionItems[i].value;
 }

formData.append(key,val);