简单了解Ajax表单序列化的实现方法

function serialize(form){var parts=[],field=null,i,len,j,optLen,option,optValue;for (i = 0; i < form.elements.length; i++) {field=form.elements[i];switch (field.type) {case 'select-one':case 'select-multiple':if(field.name.length){for (var j = 0; j < field.options.length; j++) {option=field.options[j];if (option.selected) {optValue="";if (option.hasAttribute) {optValue=(option.hasAttribute('value') ? option.value : option.text);}else{optValue=(option.attribute['value'].specified ? option.value : option.text);}parts.push(encodeURIComponent(field.name) + "=" + encodeURIComponent(optValue));}}}break;case undefined: //字段集case "file": //文本输入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;}//执行默认操作default://不包含没有名字的表单字段if(field.name.length){parts.push(encodeURIComponent(field.name) + "=" + encodeURIComponent(field.value));}}}return parts.join("&");}