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                ### Promise Ajax 下面是一個用 Promise 對象實現的 Ajax 操作的例子。 ~~~ function ajax(URL, method = 'GET', data = null) { var pro = new Promise(function(resolve, reject) { var ajax = new XMLHttpRequest(); var method=method||"GET" var data=data ||null ajax.open(method, url); ajax.send(data); ajax.onreadystatechange = function() { if (ajax.readyState == 4 && ajax.status == 200) { resolve(ajax.responseText); } } setTimeout(function() { reject("請求服務器失敗"); }, 1000) }) return pro; } ~~~ ~~~ var URL = "/try/ajax/testpromise.php"; ajax(URL).then(function onFulfilled(value){ document.write('內容是:' + value); }).catch(function onRejected(error){ document.write('錯誤:' + error); }); ~~~ > 同步操作 ~~~ var res = JSON.parse(await ajax(actionRoot + 'is_tel')); ~~~
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