Vue实现组件——可以长按加/减号自增和自减的输入框

用vue实现一个可以长按加号/减号进行自增减的输入框：思路：鼠标按下的时候启动一个定时器，控制值进行自增或者自减。当鼠标抬起的时候再取消这个定时器。

<!-- 可以长按加减号自增和自减 -->
<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
  <script src="./code/lib/vue-2.4.0.js"></script>
  <style>
    #app {
      display: flex;
      justify-content: center;
    }

    #input {
      text-align: center;
    }
  </style>
</head>

<body>
  <div id="app">
    <button class="btn" @click="subtract()" @mousedown="startSubTimer()" @mouseup="endSubTimer()">-</button>
    <input type="text" name="num" id="input" v-model="count">
    <button class="btn" @click="add()" @mousedown="startAddTimer()" @mouseup="endAddTimer()">+</button>
  </div>
</body>
<script>
  var vm = new Vue({
    el: "#app",
    data: {
      count: 0,
      timer: null,
      timer2: null,
    },
    methods: {
      add: function () {
        this.count++
      },
      subtract: function () {
        if (this.count <= 0) {
          this.count = 0;
        } else {
          this.count--;
        }
      },
      autoAddStart: function () {
        console.log(this.count)
        this.timer2 = setInterval(() => {
          this.count++
        }, 200);
        console.log("autoAddStart")
      },
      autoSubStart: function () {
        if (this.count <= 0) {
          this.count = 0
          this.timer2 = null
        } else {
          this.timer2 = setInterval(() => {
            if(this.count <= 0){
              this.count = 0
            }else {
              this.count--
            }
          }, 200);
        }
      },
      autoAddEnd: function () {
        clearTimeout(this.timer2)
        this.timer2 = null;
      },
      autoSubEnd: function(){
        clearTimeout(this.timer2)
        this.timer2 = null;
      },
      startSubTimer: function () {
        this.timer = setTimeout(() => {
          this.autoSubStart()
        }, 1000);
        console.log("mouseDown")
      },
      endSubTimer: function () {
        clearTimeout(this.timer)
        this.timer = null;
        this.autoSubEnd()
        console.log("mouseup")

      },
      startAddTimer: function () {
        this.timer = setTimeout(() => {
          console.log(this)
          this.autoAddStart()
        }, 1000);
      },
      endAddTimer: function () {
        clearTimeout(this.timer)
        this.timer = null;
        this.autoAddEnd()
      }
    }

  })
</script>

</html>

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