// 引入bindingx，此库类似于微信小程序wxs，目的是让js运行在视图层，减少视图层和逻辑层的通信折损
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const BindingX = uni.requireNativePlugin('bindingx')
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export default {
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methods: {
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// 此处不写注释，请自行体会
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nvueScrollHandler(e) {
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const anchor = this.$refs['u-scroll-list__scroll-view'].ref
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const element = this.$refs['u-scroll-list__indicator__line__bar'].ref
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const scrollLeft = e.contentOffset.x
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const contentSize = e.contentSize.width
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const { scrollWidth } = this
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const barAllMoveWidth = this.indicatorWidth - this.indicatorBarWidth
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// 在安卓和iOS上，需要除的倍数不一样，iOS需要除以2
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const actionNum = uni.$u.os() === 'ios' ? 2 : 1
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const expression = `(x / ${actionNum}) / ${contentSize - scrollWidth} * ${barAllMoveWidth}`
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BindingX.bind({
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anchor,
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eventType: 'scroll',
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props: [{
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element,
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property: 'transform.translateX',
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expression
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}]
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})
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}
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}
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}
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