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var obj={};
 $(form.serializeArray()).each(function(){
        obj[this.name]=this.value;
       //console.log(this.name,this.value);
})

//将表单元素数组或者对象序列化。是.serialize()的核心方法。
var postStr = $.param($('form').find('input,select'));
//aa=bb&cc=dd