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- function ajax(options) {
- options = options || {};
- options.type = (options.type || "GET").toUpperCase();
- options.dataType = options.dataType || "json";
- var params = formatParams(options.data);
- //创建 - 非IE6 - 第一步
- if (window.XMLHttpRequest) {
- var xhr = new XMLHttpRequest();
- } else { //IE6及其以下版本浏览器
- var xhr = new ActiveXObject('Microsoft.XMLHTTP');
- }
- //接收 - 第三步
- xhr.onreadystatechange = function () {
- if (xhr.readyState == 4) {
- var status = xhr.status;
- if (status >= 200 && status < 300) {
- options.success && options.success(xhr.responseText, xhr.responseXML);
- } else {
- options.fail && options.fail(status);
- }
- }
- }
- //连接 和 发送 - 第二步
- if (options.type == "GET") {
- xhr.open("GET", options.url + "?" + params, true);
- xhr.send(null);
- } else if (options.type == "POST") {
- xhr.open("POST", options.url, true);
- //设置表单提交时的内容类型
- xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
- xhr.send(params);
- }
-
- return xhr;
- }
- //格式化参数
- function formatParams(data) {
- var arr = [];
- for (var name in data) {
- arr.push(encodeURIComponent(name) + "=" + encodeURIComponent(data[name]));
- }
- arr.push(("v=" + Math.random()).replace(".",""));
- return arr.join("&");
- }
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