FORM serailize()

function serialize(form) {
var parts = [];
var field = null;
for (var i = 0, len = form.elements.length; i < len; i++) {
field = form.elements[i];
switch (field.type) {
case "select-one":
case "select-multiple":
for (var j = 0, optLen = field.options.length; j < optLen; i++) {
var option = field.options[i];
if (option.selected) {
var optValue = "";
if (option.hasAttribute) {
//DOM supported browser
optValue = (option.hasAttribute("value") ? option.value : option.text);
} else {
//for IE
optValue = (option.attribute("value").specified ? option.value : option.text);
}
parts.push(encodeURIComponent(field.name) + "=" + encodeURIComponent(optValue));
}
}
break;
case undefined: //字段集
case "file": //文件输入
case "submit": //提交按钮
case "reset": //重置按钮
case "button": //自定义按钮
break;
case "radio": //单选按钮
case "checkbox": //复选框
if (!field.checked) {
break;
}
/* 执行默认行为 */
default:
parts.push(encodeURIComponent(field.name) + "=" + encodeURIComponent(field.value));
}
}
return parts.join("&");
}