js秒表计时器

js秒表计时器

用普通js实现秒表计时器

  
    
    
    计时器
    
      * {
        margin: 0;
        padding: 0;
      }
      #box {
        margin: 50px auto;
        width: 300px;
        height: 400px;
        background-color: aquamarine;
      }
      .content {
        height: 100px;
        text-align: center;
        line-height: 100px;
        font-weight: 700;
        font-size: 40px;
      }
      .btn {
        text-align: center;
      }
      button {
        margin-top: 20px;
        font-size: 50px;
      }
    
  
  
    

      

        00
        00
        00
      
      

        开始计时
        暂停计时
        结束计时
      
    
  
  
    var timer
    var time = 0
    function $(id) {
      return document.getElementById(id)
    }
    var hours = $('hours'),
      minutes = $('minutes'),
      seconds = $('seconds'),
      start = $('start'),
      pause = $('pause'),
      end = $('end')
    //开始计时
    start.onclick = function () {
      this.disabled = true
      pause.disabled = false
      end.disabled = false
      timer = setInterval(move, 1000)
    }
    //暂停计时
    pause.onclick = function () {
      this.disabled = true
      start.disabled = false
      end.disabled = false
      clearInterval(timer)
    }
    //结束计时
    end.onclick = function () {
      this.disabled = true
      pause.disabled = false
      start.disabled = false
      clearInterval(timer)
      time = 0
      timeShow()
    }
    function move() {
      time++
      // console.log(time)
      timeShow()
    }
    function timeFormat(t) {
      t = t >= 10 ? t : '0' + t
      return t
    }
    function timeShow() {
      seconds.innerText = timeFormat(time % 60) //0-59
      minutes.innerHTML = timeFormat(parseInt(time / 60) % 60)
      hours.innerHTML = timeFormat(parseInt(time / 60 / 60) % 24)
    }