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                            ## setinterval
隔一段事件執行,并且會重復執行.
```
<body>
<input type="button" id="btn1" value="開始">
<input type="button" id="btn2" value="取消">
<script>

    var btn1 = document.getElementById('btn1');
    var timerId; //定時器的標識
    btn1.onclick = function () {
        var num = 1;
        //第一次執行也要等3秒鐘
        timerId = setInterval(function () {
            console.log('定時任務' + (num++));
        }, 3000)
    }

    var btn2 = document.getElementById('btn2');
    btn2.onclick = function () {
        clearInterval(timerId);
    }
</script>
```

## 倒計時案例
```

```











                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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