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                ~~~javascript const getJSON = function(url) { const promise = new Promise(function(resolve, reject){ const handler = function() { if (this.readyState !== 4) { return; } if (this.status === 200) { resolve(this.response); } else { reject(new Error(this.statusText)); } }; const client = new XMLHttpRequest(); client.open("GET", url); client.onreadystatechange = handler; client.responseType = "json"; client.setRequestHeader("Accept", "application/json"); client.send(); }); return promise; }; getJSON("/posts.json").then(function(json) { console.log('Contents: ' + json); }, function(error) { console.error('出錯了', error); }); ~~~ 上面代碼中,`getJSON`是對 XMLHttpRequest 對象的封裝,用于發出一個針對 JSON 數據的 HTTP 請求,并且返回一個`Promise`對象。需要注意的是,在`getJSON`內部,`resolve`函數和`reject`函數調用時,都帶有參數。
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