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dongsuoPanJiaChen
dongsuo
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PanJiaChen
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'新增功能：返回顶部'
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‎src/components/BackToTop/index.vue‎

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<template>
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<transition name="fade">
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<div class="back-to-top" @click="backToTop" v-show="visible">
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<el-tooltip class="item" effect="dark" content="返回顶部" placement="top">
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<i class="el-icon-arrow-up"></i>
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</el-tooltip>
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</div>
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</transition>
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</template>
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<script>
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export default {
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name: 'BackToTop',
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props: {
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visibilityHeight: {
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type: Number,
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default: 400
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},
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backPosition: {
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type: Number,
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default: 0
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}
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},
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data() {
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return {
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visible: false
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}
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},
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mounted() {
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window.addEventListener('scroll', this.handleScroll)
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},
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beforeDestroy() {
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window.removeEventListener('scroll', this.handleScroll)
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},
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methods: {
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handleScroll() {
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this.visible = window.pageYOffset > this.visibilityHeight;
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},
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backToTop() {
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const start = window.pageYOffset;
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let i = 0;
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const t = setInterval(() => {
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const next = Math.floor(this.easeInOutQuad(10 * i, start, -start, 500));
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if (next <= this.backPosition) {
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window.scrollTo(0, this.backPosition);
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clearInterval(t)
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} else {
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window.scrollTo(0, next);
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}
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i++;
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}, 16.7)
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},
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easeInOutQuad(t, b, c, d) {
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if ((t /= d / 2) < 1) return c / 2 * t * t + b;
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return -c / 2 * (--t * (t - 2) - 1) + b;
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}
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}
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}
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</script>
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<style scoped>
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.back-to-top {
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position: fixed;
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right: 50px;
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bottom: 50px;
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display: inline-block;
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height: 40px;
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width: 40px;
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box-shadow: 1px 1px 1px #58B7FF;
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text-align: center;
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cursor: pointer;
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background: #58B7FF;
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color: #fff;
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}
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.fade-enter-active,
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.fade-leave-active {
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transition: opacity 1s
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}
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.fade-enter,
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.fade-leave-to {
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opacity: 0
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}
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.back-to-top i {
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display: inline-block;
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width: 100%;
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height: 100%;
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line-height: 40px;
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}
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</style>
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‎src/router/index.js‎

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@@ -28,6 +28,7 @@ const Sticky = _import('components/sticky');
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const SplitPane = _import('components/splitpane');
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const CountTo = _import('components/countTo');
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const Mixin = _import('components/mixin');
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const BackToTop = _import('components/backToTop')
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/* charts */
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const chartIndex = _import('charts/index');
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{ path: 'dropzone', component: Dropzone, name: 'Dropzone' },
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{ path: 'sticky', component: Sticky, name: 'Sticky' },
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{ path: 'countto', component: CountTo, name: 'CountTo' },
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{ path: 'mixin', component: Mixin, name: '小组件' }
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{ path: 'mixin', component: Mixin, name: '小组件' },
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{ path: 'backtotop', component: BackToTop, name: '返回顶部' }
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]
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},
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{

‎src/views/components/backToTop.vue‎

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<template>
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<div class="components-container">
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<code>页面滚动到指定位置会在右下角出现返回顶部按钮</code>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<div>我是占位</div>
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<back-to-top id="back-to-top-t" :visibilityHeight="300" :backPosition="50"></back-to-top>
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</div>
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</template>
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<script>
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import BackToTop from 'components/BackToTop';
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export default {
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components: { BackToTop }
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}
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</script>
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<style scoped>
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#back-to-top-t{
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right: 100px;
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bottom: 100px;
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}
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</style>

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