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                setInterval(callBack,time); <br/> 定時器是BOM對象方法,因此可以忽略window <br/> <br/> 第一個參數【回調函數:當一個函數執行的時候,傳遞實參是另外一個函數聲明部分】必有的。 <br/> <br/> 第二個參數【時間:毫秒】1s=1000ms <br/> <br/> //定時器 clearInterval(定時器函數名稱); //清除定時器 <br/> <br/> <br/> 定時器是異步語句:先執行異步語句后面的代碼,回首執行定時器 語法: ``` <script type="text/javascript"> var dingshi=window.setInterval(function(){ console.log("我是定時器"); },1000); //1000為毫秒單位 clearInterval(dingshi); //清除定時器 </script> ``` # 第二種定時器: ## setTimeout(function(){}) ## 過多少秒執行 ~~~ setTimeout(function() { console.log("我是定時器"); },500); ~~~
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