93 lines
1.8 KiB
Vue
93 lines
1.8 KiB
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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