/*
* 添加到購物車動畫 腳本
* */
/***
* 動畫軌跡控制
* @param addBtnDom 增加按鈕的dom元素或者選擇器
* @param shopCarDom 購物車的dom元素或選擇器
*/
function controllPath(addBtn, shopCar) {
var addBtnDom = null,
shopCarDom = null;
if(typeof addBtn === "string"){
addBtnDom = document.querySelector(addBtn);
} else if(addBtn instanceof HTMLElement){
addBtnDom = addBtn
} else {
alert("傳入的參數錯誤： 第一個參數應為增加按鈕的dom元素或該元素的選擇器。");
return;
}
if(typeof shopCar === "string"){
shopCarDom = document.querySelector(shopCar);
} else if(shopCar instanceof HTMLElement){
shopCarDom = shopCar;
}else {
alert("傳入的參數錯誤： 第二個參數應為購物車的dom元素或該元素的選擇器。");
return;
}
// 獲取兩個dom的位置
var addBtnposition = addBtnDom.getBoundingClientRect();
var shopCarPosition = shopCarDom.getBoundingClientRect();
var addBtnCenterX = (addBtnposition.left + addBtnposition.right) / 2;
var addBtnCenterY = (addBtnposition.top + addBtnposition.bottom) / 2;
var shopCarCenterX = (shopCarPosition.left + shopCarPosition.right) / 2;
var shopCarCenterY = (shopCarPosition.top + shopCarPosition.bottom) / 2;
//計算增加按鈕 是在 相對於購物車的 左邊還是右邊（用於控制后面的移動方向）
var relativePosition = addBtnCenterX > shopCarCenterX ? -1 : 1;
// 獲取連個dom之間的距離
var xDistance = Math.abs(addBtnCenterX - shopCarCenterX);
var yDistance = Math.abs(addBtnCenterY - shopCarCenterY);
// 繪制小球並設置其位置
var ballDom = drawBall();
ballDom.style.top = addBtnCenterY + "px";
ballDom.style.left = addBtnCenterX + "px";
document.body.appendChild(ballDom);
/*
* 根據一元二次方程的軌跡求出對象的系數 y = ax^2 + bx + c
* var coefficientC = 0;
* var coefficientB = 0;
* var coefficientA = yDistance / Math.pow(xDistance, 2);
*/
//小球的橫豎坐標
var xAbscissa = 0, yAbscissa = 0;
//設置移動路徑
var ballTimer = setInterval(function () {
//每次重新坐標
xAbscissa += 5 * relativePosition;
yAbscissa = (yDistance / Math.pow(xDistance, 2)) * Math.pow(xAbscissa, 2);
ballDom.style.top = addBtnCenterY + yAbscissa + "px";
ballDom.style.left = addBtnCenterX + xAbscissa + "px";
//檢查是否到達終點
var surplusDistance = parseInt(ballDom.style.left) - shopCarCenterX;
if (Math.abs(surplusDistance) <= 10) {
clearInterval(ballTimer);
}
}, 25);
}
/*
* 繪制小球
* */
function drawBall() {
var ballDom = document.createElement("div");
ballDom.style.width = "20px";
ballDom.style.height = "20px";
ballDom.style.border = "1px solid #ccc";
ballDom.style.background = "#73dd51";
ballDom.style.borderRadius = "50%";
ballDom.style.position = "absolute";
return ballDom;
}
使用說明
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no"/>
<title>添加到購物車</title>
<style>
html, body {
margin: 0;
padding: 0;
height: 100%;
}
.box {
position: relative;
width: 100%;
height: 100%;
border: 2px solid #cc726f;
box-sizing: border-box;
}
.add-btn {
width: 40px;
height: 40px;
border: 2px solid orange;
border-radius: 50%;
position: absolute;
top: 10px;
left: 10px;
background: antiquewhite;
box-sizing: border-box;
}
.add-btn:before, .add-btn:after {
content: "";
position: absolute;
top: 50%;
left: 10%;
margin-top: -2px;
width: 80%;
height: 4px;
background: white;
}
.add-btn:after {
transform: rotate(90deg);
}
.shop-car {
width: 100px;
height: 40px;
border: 1px solid #ff574d;
position: absolute;
top: 300px;
left: 100px;
text-align: center;
line-height: 40px;
}
</style>
</head>
<body>
<div class="box">
<div class="add-btn"></div>
<div class="shop-car">購物車</div>
</div>
<script src="./addToCar.js"></script>
<script>
var addBtnDom = document.querySelector(".add-btn");
var shopCarDom = document.querySelector(".shop-car");
addBtnDom.addEventListener("click",function () {
//第一種方式
controllPath(addBtnDom, shopCarDom);
//第二種方式
//controllPath(".add-btn", ".shop-car");
})
</script>
</body>
</html>