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                ## 如果做實時獲取數據? #### websocket協議 ~~~ // 這是socket接口的地址 var wsServer = 'ws://localhost:8888/Demo' // 新建socket對象 var websocket = new WebSocket(wsServer) // 通過onmessage事件,一旦后端接口數據更新,那么會實時傳送到客戶端。 websocket.onmessage = function (evt) { //evt里面包含最新的數據 } ~~~ 跟http協議區別在于請求后鏈接是不斷的,只要數據有更新,會實時傳輸到客戶端。 <br> #### 通過定時器里面ajax調用接口。 ~~~ setInterval(function(){ // ajax調用 }, 1000) ~~~ 相當于每一秒鐘更新一次數據
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