進度條組件mark

子組件內容：

template部分

<template>
    <div class="slider" ref="slider">
        <div class="process" :style="{width}"></div>
        <div class="thunk" ref="trunk" :style="{left}">
            <div class="block"></div>
            <div class="tips">
                <span>{{scale*100}}</span>
                <i class="fas fa-caret-down" ></i>
            </div>
        </div>
    </div>
</template>

**

js部分

**

<script>
    /*
    * min 進度條最小值
    * max 進度條最大值
    * v-model 對當前值進行雙向綁定實時顯示拖拽進度
    * */
    export default{
        name:'myProgress',
        props:['min','max','value'],
        data(){
            return{
                slider:null, //滾動條DOM元素
                thunk:null,  //拖拽DOM元素
                per:this.value, //當前值
            }
        },
        //渲染到頁面的時候
        mounted () {
            this.slider = this.$refs.slider;
            this.thunk = this.$refs.trunk;
            var _this = this;
            this.thunk.onmousedown = function (e) {
                var width = parseInt(_this.width);
                var disX = e.clientX;
                document.onmousemove = function(e){
                    // value, left, width
                    // 當value變化的時候，會通過計算屬性修改left，width

                    // 拖拽的時候獲取的新width
                    var newWidth = e.clientX - disX + width;
                    // 拖拽的時候得到新的百分比
                    var scale = newWidth / _this.slider.offsetWidth;
                    _this.per = Math.ceil((_this.max - _this.min) * scale + _this.min);
                    _this.per = Math.max(_this.per,_this.min);
                    _this.per = Math.min(_this.per,_this.max);
                }
                document.onmouseup = function(){
                    document.onmousemove = document.onmouseup = null;
                }
                return false;
            }
        },
        computed:{
            // 設置一個百分比，提供計算slider進度寬度和trunk的left值
            // 對應公式爲 當前值-最小值/最大值-最小值 = slider進度width / slider總width
            // trunk left = slider進度width + trunk寬度/2
            scale(){
                return (this.per - this.min) / (this.max - this.min);
                console.log(1);
            },
            width(){
                console.log(2);
                if(this.slider){
                    return this.slider.offsetWidth * this.scale + 'px';
                }else{
                    return 0 + 'px'
                }
            },
            left(){
                console.log(3);
                if(this.slider){
                    return this.slider.offsetWidth * this.scale - this.thunk.offsetWidth/2 + 'px';
                }else{
                    return 0 + 'px'
                }
            }
        },
        watch:{
            scale(newVal, old){
                this.$emit("onChange",newVal)
            }
        }
    }
</script>

style部分

<style>
    .box{margin:100px auto 0;width:80%}
    .clear:after{content:'';display:block;clear:both}
    .slider{position:relative;margin:20px 0;width:200px;height:10px;background:#e4e7ed;border-radius:5px;cursor:pointer}
    .slider .process{position:absolute;left:0;top:0;width:112px;height:10px;border-radius:5px;background:#409eff}
    .slider .thunk{position:absolute;left:100px;top:-7px;width:20px;height:20px}
    .slider .block{width:20px;height:20px;border-radius:50%;border:2px solid #409eff;background:rgba(255,255,255,1);transition:.2s all}
    .slider .tips{position:absolute;left:-7px;bottom:30px;min-width:15px;text-align:center;padding:4px 8px;background:#409eff;border-radius:5px;height:24px;color:#fff}
    .slider .tips i{position:absolute;margin-left:-5px;left:50%;bottom:-9px;font-size:16px;color:#409eff}
    .slider .block:hover{transform:scale(1.1);opacity:.6}
</style>

父組件引用

import myProgress from '../Video/myProgress.vue'

html中使用

<myProgress class="my-comment" :min=0 :max=100 v-model = "opacityVal" @onChange="onChange"  style="position: absolute;left: 5% ;bottom: 10%;"></myProgress>

methods裏面接受的子組件的數據

onChange(val){
   console.log(val,'121212')
 }