html表单通过for循环,萌新提问！！！如何用for循环循环表单？

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function submit_() {

var json = "{";

var formdata = document.getElementById("test_form")

for (i = 0; i < formdata.length-2; i++)

{

var key = formdata[i].name;

console.log(key);

json = json + "'" + key + "'"+":";

if (formdata[i].value == null || formdata[i].value == "") {

var value = formdata[i].value;

json = json + "'" + null + "'" + ",";

}

else

{

var value = formdata[i].value;

json = json + "'" + value + "'" + ",";

}

}

json = json + "}";

console.log(json);

$.ajax({

url: "/body/submit",

type: 'post',

data: {formdata:json},

success: function (data)

{

if (data == true)

console.log("添加成功");

}

});

}