vue @mousemove实现拖动，鼠标移动过快拖动卡顿

需求

使用vue实现滑动拼图验证码

踩到的坑

使用@mousemove绑定事件拖拽速度过快有严重的卡顿

源代码

<template>
  <div class="slider-verify">
    <div class="img">
      <img src="./101.jpg" class="big-img" />
      <img
        ref="block"
        src="./101.jpg"
        class="small-img"
        @mousemove="handleDragMove"
        @mousedown="handleDragStart"
        @mouseup="handleDragEnd"
      />
    </div>
    <div ref="sliderContainer" class="sliderContainer">
      <div ref="sliderMask" class="sliderMask">
        <div ref="slider" class="slider">
          <i
            class="el-icon-right"
            @mousemove="handleDragMove"
            @mousedown="handleDragStart"
            @mouseup="handleDragEnd"
          ></i>
        </div>
      </div>
      <span class="sliderText">向右滑动填充拼图</span>
    </div>
  </div>
</template>

<script>
export default {
  name: "SliderVerify",
  props: {
    width: {
      type: Number,
      default: 310
    }
  },
  data() {
    return {
      isMouseDown: false,
      originX: 0,
      originY: 0,
      slider: null,
      sliderMask: null,
      sliderContainer: null,
      block: null
    };
  },
  created() {
    this.$nextTick(() => {
      this.slider = this.$refs.slider;
      this.sliderMask = this.$refs.sliderMask;
      this.sliderContainer = this.$refs.sliderContainer;
      this.block = this.$refs.block;
    });
  },
  methods: {
    handleDragMove(e) {
      if (!this.isMouseDown) return false;
      const w = this.width;
      // 获取拖拽移动的距离
      const eventX = e.clientX || e.touches[0].clientX;
      const moveX = eventX - this.originX;
      if (moveX < 0 || moveX + 40 >= w) return false;
      this.slider.style.left = moveX + "px";
      this.block.style.left = moveX + "px";
      this.sliderMask.style.width = moveX + "px";
    },
    handleDragStart(e) {
      // 获取拖拽起始位置坐标
      this.originX = e.clientX || e.touches[0].clientX;
      this.originY = e.clientY || e.touches[0].clientY;
      this.isMouseDown = true;
    },
    handleDragEnd(e) {
      if (!this.isMouseDown) return false;
      this.isMouseDown = false;
      const eventX = e.clientX || e.changedTouches[0].clientX;
      if (eventX === this.originX) return false;
    }
  }
};
</script>
...

解决方案

使用JS原生事件替代Vue v-on事件

优化后代码

<template>
  <div class="slider-verify">
    <div class="img">
      <img src="./101.jpg" class="big-img" />
      <img
        ref="block"
        src="./101.jpg"
        class="small-img"
        @mousedown="handleDragStart"
      />
    </div>
    <div ref="sliderContainer" class="sliderContainer">
      <div ref="sliderMask" class="sliderMask">
        <div ref="slider" class="slider">
          <i
            class="el-icon-right"
            @mousedown="handleDragStart"
          ></i>
        </div>
      </div>
      <span class="sliderText">向右滑动填充拼图</span>
    </div>
  </div>
</template>

<script>
export default {
  name: "SliderVerify",
  props: {
    width: {
      type: Number,
      default: 310
    }
  },
  data() {
    return {
      isMouseDown: false,
      originX: 0,
      originY: 0,
      slider: null,
      sliderMask: null,
      sliderContainer: null,
      block: null
    };
  },
  created() {
    this.$nextTick(() => {
      this.slider = this.$refs.slider;
      this.sliderMask = this.$refs.sliderMask;
      this.sliderContainer = this.$refs.sliderContainer;
      this.block = this.$refs.block;
    });
  },
  methods: {
    handleDragStart(e) {
      // 获取拖拽起始位置坐标
      this.originX = e.clientX || e.touches[0].clientX;
      this.originY = e.clientY || e.touches[0].clientY;
      this.isMouseDown = true;
      document.onmousemove = (ev) => {
        if (!this.isMouseDown) return false;
        const w = this.width;
        // 获取拖拽移动的距离
        const eventX = ev.clientX || ev.touches[0].clientX;
        const moveX = eventX - this.originX;
        if (moveX < 0 || moveX + 40 >= w) return false;
        this.slider.style.left = moveX + "px";
        this.block.style.left = moveX + "px";
        this.sliderMask.style.width = moveX + "px";
      };
      document.onmouseup = (ev) => {
        if (!this.isMouseDown) return false;
        this.isMouseDown = false;
        const eventX = ev.clientX || ev.changedTouches[0].clientX;
        if (eventX === this.originX) return false;
      };
    }
  }
};
</script>
...

优化后效果

Ending......