本文介紹的是利用Vue實現購物小球拋物線的相關內容，下面話不多說了，來一起看看詳細的介紹吧

css片段

.shop{ position: fixed; top: 300px; left: 40px; } .ball{ position: fixed; left: 32px; bottom: 22px; z-index: 200; transition: all 0.4s cubic-bezier(0.49, -0.29, 0.75, 0.41); /*貝塞爾曲線*/ } .inner{ width: 16px; height: 16px; border-radius: 50%; background-color: rgb(0,160,220); transition: all 0.4s linear; } .cart{ position: fixed; bottom: 22px; left: 32px; width: 30px; height: 30px; background-color: rgb(0,160,220); color: rgb(255,255,255); }

html片段

<div id='app'> <ul class='shop'> <li v-for='item in items'> <span>{{item.text}}</span> <span>{{item.price}}</span> <button @click='additem'>添加</button> </li> </ul> <div style=''>{{count}}</div> <div class='ball-container'><!--小球--> <div v-for='ball in balls'> <transition name='drop' @before-enter='beforeDrop' @enter='dropping' @after-enter='afterDrop'> <div v-show='ball.show'> <div class='inner inner-hook'></div> </div> </transition> </div> </div> </div>

js片段

<script> new Vue({ el:'#app', data:{ count: 0, items:[ { text: '蘋果', price: 15 }, { text: '香蕉', price: 15 } ], balls: [ //小球 設為3個 { show: false }, { show: false }, { show: false }, ], dropBalls:[], }, methods:{ additem(event){ this.drop(event.target); this.count ++; }, drop(el){ //拋物 for(let i=0;i<this.balls.length;i++){ let ball= this.balls[i]; if(!ball.show){ ball.show = true; ball.el=el; this.dropBalls.push(ball); return; } } }, beforeDrop(el) {/* 購物車小球動畫實現 */ let count = this.balls.length; while (count--) { let ball = this.balls[count]; if (ball.show) { let rect = ball.el.getBoundingClientRect(); //元素相對于視口的位置 let x = rect.left - 32; let y = -(window.innerHeight - rect.top - 22); //獲取y el.style.display = ’’; el.style.webkitTransform = ’translateY(’+y+’px)’; //translateY el.style.transform = ’translateY(’+y+’px)’; let inner = el.getElementsByClassName(’inner-hook’)[0]; inner.style.webkitTransform = ’translateX(’+x+’px)’; inner.style.transform = ’translateX(’+x+’px)’; } } }, dropping(el, done) { /*重置小球數量 樣式重置*/ let rf = el.offsetHeight; el.style.webkitTransform = ’translate3d(0,0,0)’; el.style.transform = ’translate3d(0,0,0)’; let inner = el.getElementsByClassName(’inner-hook’)[0]; inner.style.webkitTransform = ’translate3d(0,0,0)’; inner.style.transform = ’translate3d(0,0,0)’; el.addEventListener(’transitionend’, done); }, afterDrop(el) { /*初始化小球*/ let ball = this.dropBalls.shift(); if (ball) { ball.show=false; el.style.display = ’none’; } } } }) </script>

transtion屬性可以查看官方文檔，具體位置可以通過調試獲得。

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