【微信小程序-组件】仪表盘样式的滑动组件（不卡顿）

<template>
    <view class="gear-select">
        <view class="scale-mark-container">
            <view class="every-scale-mark" v-for="(gear, index) of gearList" :key="gear.num">
                <view class="scale-line"></view>
                <view class="scale-text">{{ gear.num + ((index === 0 || index === gearList.length - 1) ? unit : '') }}</view>
            </view>
        </view>
        <view class="new-slider-component">
            <label :style="{ left: `calc(${style} - 12px)` }">{{ valueForLabel }}</label>
            <view class="combine-mine_slider-and-u_slider">
                <view class="show-slider">
                    <view class="back-track">
                        <view class="front-track" :style="{width: `${style}`}"></view>
                        <view class="slider-block" :style="{left: `calc(${style} - 12px)`}">
                            <view class="silder-block_center"></view>
                        </view>
                    </view>
                </view>
                <u-slider
                    v-model="valueForSlider"
                    :min="gearMinForSlider"
                    :max="gearMaxForSlider"
                    height="20"
                    block-size="32"
                    blockColor="#161514"
                    :step="stepScale"
                    :blockStyle="{border: '8rpx solid #fff5de'}"
                    @changing="sliderChange"
					@change="moveEnd"
                />
            </view>
        </view>
    </view>
</template>

<script>
export default {
    name: "GearSelect",

    props: {
        gearList: { // 组件刻度背景（即虚线下方的文字集合）
            type: Array,
            default: () => []
        },
        unit: {
            type: String,
            default: ''
        },
        value: {
            type: Number,
            default: 0
        },
        gearMin: {
            type: Number,
            default: 0
        },
        gearMax: {
            type: Number,
            default: 0
        },
        sliderStep: {
            type: Number,
            default: 1
        },
        sliderBase: {
            type: Number,
            default: 0
        },
		labelIsNum: { // 滑动组件上方显示的标签是否为数字
			type: Boolean,
			default: true
		}
    },

    data() {
        return {
            valueForSlider: 0,
            gearMinForSlider: 0,
            gearMaxForSlider: 0,
            stepScale: 5,
            valueForLabel: 0,
        }
    },

    watch: {
        value(val) {
			console.log('value')
			console.log(val)
            this.valueForSlider = val * this.stepScale
        },
        gearMin(val) {
          this.gearMinForSlider = val * this.stepScale
        },
        gearMax(val) {
            this.gearMaxForSlider = val * this.stepScale
        },
    },

    computed: {
        style() {
            return `${((this.valueForSlider - this.gearMinForSlider) / (this.gearMaxForSlider - this.gearMinForSlider)) * 100}%`
        }
    },

    created() {
        this.valueForSlider = this.value * this.stepScale
        this.gearMinForSlider = this.gearMin * this.stepScale
        this.gearMaxForSlider = this.gearMax * this.stepScale
        this.sliderChange(this.valueForSlider)
    },

    methods: {
        sliderChange(val) {
            let value = val / this.stepScale
			let label = value * this.sliderStep + this.sliderBase
			if (this.labelIsNum) {
				this.valueForLabel = label + this.unit
			} else {
				let index = value / this.sliderStep
				this.valueForLabel = this.gearList[index].num
			}
            this.$emit('input', value)
        },
		
		moveEnd(val) {
			let value = val / this.stepScale
			let label = value * this.sliderStep + this.sliderBase
			if (this.labelIsNum) {
				this.valueForLabel = label + this.unit
			} else {
				let index = value / this.sliderStep
				this.valueForLabel = this.gearList[index].num
			}
			this.$emit('valueChange', value)
			this.$emit('labelChange', this.valueForLabel)
		}
    }
}
</script>