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使用 uview 重构实际登陆
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<template>
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<u-transition
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mode="fade"
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:customStyle="backTopStyle"
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:show="show"
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>
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<view
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class="u-back-top"
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:style="contentStyle"
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v-if="!$slots.default && !$slots.$default"
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@click="backToTop"
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>
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<u-icon
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:name="icon"
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:custom-style="iconStyle"
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></u-icon>
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<text
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v-if="text"
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class="u-back-top__text"
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>{{text}}</text>
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</view>
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<slot v-else />
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</u-transition>
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</template>
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<script>
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import props from './props.js';
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// #ifdef APP-NVUE
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const dom = weex.requireModule('dom')
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// #endif
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/**
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* backTop 返回顶部
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* @description 本组件一个用于长页面,滑动一定距离后,出现返回顶部按钮,方便快速返回顶部的场景。
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* @tutorial https://uviewui.com/components/backTop.html
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*
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* @property {String} mode 返回顶部的形状,circle-圆形,square-方形 (默认 'circle' )
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* @property {String} icon 自定义图标 (默认 'arrow-upward' ) 见官方文档示例
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* @property {String} text 提示文字
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* @property {String | Number} duration 返回顶部滚动时间 (默认 100)
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* @property {String | Number} scrollTop 滚动距离 (默认 0 )
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* @property {String | Number} top 距离顶部多少距离显示,单位px (默认 400 )
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* @property {String | Number} bottom 返回顶部按钮到底部的距离,单位px (默认 100 )
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* @property {String | Number} right 返回顶部按钮到右边的距离,单位px (默认 20 )
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* @property {String | Number} zIndex 层级 (默认 9 )
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* @property {Object<Object>} iconStyle 图标的样式,对象形式 (默认 {color: '#909399',fontSize: '19px'})
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* @property {Object} customStyle 定义需要用到的外部样式
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*
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* @example <u-back-top :scrollTop="scrollTop"></u-back-top>
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*/
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export default {
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name: 'u-back-top',
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mixins: [uni.$u.mpMixin, uni.$u.mixin,props],
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computed: {
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backTopStyle() {
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// 动画组件样式
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const style = {
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bottom: uni.$u.addUnit(this.bottom),
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right: uni.$u.addUnit(this.right),
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width: '40px',
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height: '40px',
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position: 'fixed',
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zIndex: 10,
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}
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return style
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},
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show() {
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let top
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// 如果是rpx,转为px
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if (/rpx$/.test(this.top)) {
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top = uni.rpx2px(parseInt(this.top))
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} else {
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// 如果px,通过parseInt获取其数值部分
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top = parseInt(this.top)
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}
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return this.scrollTop > top
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},
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contentStyle() {
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const style = {}
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let radius = 0
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// 是否圆形
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if(this.mode === 'circle') {
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radius = '100px'
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} else {
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radius = '4px'
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}
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// 为了兼容安卓nvue,只能这么分开写
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style.borderTopLeftRadius = radius
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style.borderTopRightRadius = radius
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style.borderBottomLeftRadius = radius
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style.borderBottomRightRadius = radius
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return uni.$u.deepMerge(style, uni.$u.addStyle(this.customStyle))
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}
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},
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methods: {
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backToTop() {
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// #ifdef APP-NVUE
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if (!this.$parent.$refs['u-back-top']) {
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uni.$u.error(`nvue页面需要给页面最外层元素设置"ref='u-back-top'`)
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}
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dom.scrollToElement(this.$parent.$refs['u-back-top'], {
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offset: 0
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})
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// #endif
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// #ifndef APP-NVUE
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uni.pageScrollTo({
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scrollTop: 0,
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duration: this.duration
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});
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// #endif
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this.$emit('click')
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}
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}
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}
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</script>
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<style lang="scss" scoped>
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@import '../../libs/css/components.scss';
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$u-back-top-flex:1 !default;
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$u-back-top-height:100% !default;
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$u-back-top-background-color:#E1E1E1 !default;
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$u-back-top-tips-font-size:12px !default;
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.u-back-top {
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@include flex;
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flex-direction: column;
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align-items: center;
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flex:$u-back-top-flex;
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height: $u-back-top-height;
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justify-content: center;
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background-color: $u-back-top-background-color;
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&__tips {
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font-size:$u-back-top-tips-font-size;
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transform: scale(0.8);
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}
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}
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</style>
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