angularjs同步请求

js 
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    .service('Syncservice', function () {
       function fetch(url) {
           var request;
           if (window.XMLHttpRequest) {
               request = new XMLHttpRequest();
           } else if (window.ActiveXObject) {
               request = new ActiveXObject("Microsoft.XMLHTTP");
           } else {
               throw new Error("Your browser don't support XMLHttpRequest");
           }
           request.open('GET', url, false);
           request.send(null);

           if (request.status === 200) {
               return request.responseText;
           }
       }
       return {
           fetch: fetch
       }
});

调用

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var data = Syncservice.fetch('/api/data/'+i); ```


当然 以上同步请求会阻断当前页面 在console中警告
​``` Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user's experience. For more help, check http://xhr.spec.whatwg.org/ ```
意思就是在js的主进程中调用同步请求影响用户体验，可以使用worker进程进行同步请求 这样会有较好的用户体验 具体使用方法请自行google之