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关于css:实现类似手机悬浮按钮样式

jiezi

因为我的项目须要，想要在某个页面实现一个相似 iPhone 悬浮按钮的性能。
在之前的发问里（链接：div 设置了 touchmove，后果 overflow 不失效了），有写到对于按钮高低挪动的款式，当初欠缺左右挪动的切换以及对应款式的扭转。
HTML 代码：

<template>
  <div style="touch-action: none;">
    <div id="divMove" :class="!isClick &&'divMove'"   @click="handleStretch"@mousedown="down"@touchstart="down"@mousemove="move"@touchmove.prevent="move"@mouseup="end"@touchend="end"
    >
    </div>
      <div id="stretchBtn" :class="positionNow =='right'?'stretchBtn showStyle':'stretchBtn showStyleLeft'"  >
      <div id="iconImg" class="iconImg" >
        <div v-if="!isClick" id="imgM">
          <div id="backBtn" :class="positionNow =='right'?'backBtn':'backBtnLeft' "></div>
          <div id="backBtnM" class="backBtnM" :style="positionNow =='right'?'margin-left:15px':'margin-left:30px; transform: rotateY(0) ' "></div>
        </div>
      </div>

      <div v-if="isClick" :class="positionNow =='right'?'toIndex':'toIndexLeft'" >
          <img src="../assets/img/zhuye.png" width="100%" height="35px">
      </div>
      <div v-if="isClick" id="lineImg" class="lineImg" :style="positionNow ==='right'?'margin-right: 5px':'margin-right: 5px' ">
        <div v-for="(item, index) in imgSrc" :key="index" class="divBorder imgSpacing">
          <img :src="item.icon" width="30px" height="30px" style="border-radius:5px">
        </div>
      </div>
      <div v-if="isClick" id="shouqi" :class="positionNow =='right'?'shouqi':'shouLeft'" >
        <img :src="positionNow ==='right'? require('../assets/img/shouqi.png') : require('../assets/img/shouLeft.png')"
          alt=""width="10px"height="20px"@click="handleStretch" />
      </div>
    </div>

  </div>

</template>

一开始想要通过 document.getElementById() 去更改款式，然而在切换的时候，会造成提早。于是采纳了 v-bind 判断以后悬浮按钮地位，进而渲染不同的款式。
JavaScript 代码：


    // 实现挪动端拖拽
    down(e){
      this.flags = true;
      let touch;
      const odiv = e.target;
      event.touches ? touch = event.touches[0] : touch = event;
      this.position.y = touch.clientY;
      this.position.x = touch.clientX;
      this.dy = odiv.offsetTop;
      this.dX = odiv.offsetLeft;


      const objImgM = document.getElementById('imgM');
      objImgM && (objImgM.style.opacity = '1');

    },
    move(e){if(this.flags){
        let touch ;
        const objStratch = document.getElementById('stretchBtn');
        const objIconImg = document.getElementById('iconImg');
        const odiv = e.target;
        event.touches ? touch = event.touches[0] : touch = event;
        this.ny = touch.clientY - this.position.y;
        this.nx = touch.clientX - this.position.x;
        this.yPum = this.dy+this.ny;
        this.XPum = this.dX+this.nx;

        odiv.style.top = this.yPum +"px";
        objStratch.style.top = this.yPum +"px";

        odiv.style.left = this.XPum +"px";
        objIconImg.style.left = this.XPum +"px";


        // 阻止页面的滑动默认事件；如果碰到滑动问题，1.2 请留神是否获取到 touchmove
        document.addEventListener('touchmove', function(event) {
          // 判断默认行为是否能够被禁用
          if (event.cancelable) {
              // 判断默认行为是否曾经被禁用
            if (!event.defaultPrevented) {event.preventDefault();
            }
          }
        }, false);
      }
    },
    // 鼠标开释时候的函数
    end(e){
      this.flags = false;
      const objImgM = document.getElementById('imgM');
      objImgM && (objImgM.style.opacity = '0.7');
      // 判断 左右挪动
      if(this.XPum){
        // 挪动之后才会有值。this.XPum < (window.screen.width / 2) ? this.positionNow = 'left' : this.positionNow = 'right';
      }
      this.setBtnPosition();},
    setBtnPosition() {const objStratch = document.getElementById('stretchBtn');
      const objMove = document.getElementById('divMove');
      const objIconImg = document.getElementById('iconImg');

      if(this.positionNow === 'left'){// console.log('在左侧~~~~~~')
        objMove.style.left = '0';
        objStratch.style.left = '0';
        objIconImg.style.left = '0';

      }else{
        const positionMove = window.screen.width - 70;
        const positionIconImg = window.screen.width - 70;
        const positionStratch = window.screen.width - 190;
        objMove.style.left = `${positionMove}px`;
        objStratch.style.left =  `${positionStratch}px`;
        objIconImg.style.left =  `${positionIconImg}px`;
      }
    },

其中，跟之前的高低挪动多了一点的中央是
1，X 轴的地位变动，及其赋值。如下所示：

 //down(e)
this.dX = odiv.offsetLeft;
// move(e)
this.XPum = this.dX+this.nx;
odiv.style.left = this.XPum +"px";
objIconImg.style.left = this.XPum +"px";

2，按钮半透明款式切换
默认值为：0.7，点下 为 1，松开变回 0.7

// down(e)
const objImgM = document.getElementById('imgM');
objImgM && (objImgM.style.opacity = '1');
// move(e)
const objImgM = document.getElementById('imgM');
objImgM && (objImgM.style.opacity = '0.7');

3，左右地位的判断，次要就是 setBtnPosition() 这个办法。
当在左边的时候，间接获取屏幕宽度 减去 以后 div 的宽度。
之前有想要去除 left，设置 right=0，然而没有失效。于是改用这个办法，若有晓得的，麻烦留言一下。让我多学学。

css 代码：


.stretchBtn {
  position: fixed;
  top: 0;
  right: 0;
  display: flex;
  flex-direction: row-reverse;
  z-index: 1000;
  max-height: 100px;
}
.iconImg{
  position: fixed;
  display: flex;
  flex-direction: row-reverse;
  justify-content: center;

}
#imgM{
  opacity: 0.7;
  width: 60px;
}
.backBtnM{
  height: 30px;
  background: url('~/assets/img/gamePlay/icon2.png') no-repeat;
  background-size: 25px 25px;
  margin-top: -40px;
  margin-left: 15px;
}
.backBtn{
  width: 70px;
  height: 48px;
  background: url('~/assets/img/gamePlay/back-btn2.png') no-repeat;
  background-size: 237%;
}

.backBtnLeft{
  width: 70px;
  height: 48px;

  background: url('~/assets/img/gamePlay/back-btn2.png') no-repeat;
  background-size: 237%;
  transform: rotateY(180deg);
}
.showStyle{
  width: 195px;
  background: url('~/assets/img/gamePlay/back-btn2.png') no-repeat;
  background-size: 100% 50px;

}

.showStyleLeft{
  width: 195px;
  background: url('~/assets/img/gamePlay/back-btn.png') no-repeat;
  background-size: 100% 50px;
}
.lineImg{
  display: flex;
  flex-direction: row-reverse;
  overflow-x: auto;
  height: 50px;
  margin-top: 8px;
  z-index: 1999;
}
.lineImg::-webkit-scrollbar {width: 0 !important}
.imgSpacing{padding: 0 3px;}
.divMove{
  position: fixed;
  right: 0;
  width:70px;
  height: 43px;
  background-color: rgba(214, 106, 106, 0);
  z-index: 1999;
}
.shouqi{
  display: flex;
  justify-content: center;
  align-items: center;
  margin-right: 5px;
  height: 50px;
  margin-top:-2px
}

.shouLeft{
  display: flex;
  justify-content: center;
  align-items: center;
  margin-right: -128px;
  height: 50px;
  margin-top:-2px
}
.toIndex{
  margin-top: 5px;
  margin-right: 15px;
}
.toIndexLeft{
  position: relative;
  left: -150px;
  margin-top: 5px;
}

对于有些图片的地位，间接采纳了 margin 负值和 定位走的。感觉不是很好，心愿看到文章的各路好汉多支支招。在此谢过了。

到此，悬浮按钮的款式算是实现了。
效果图：
就参考你们本人手机上的悬浮按钮吧，嘻嘻。

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