Home > Article > Web Front-end > Detailed explanation of examples of JS encapsulation of animate motion framework

Detailed explanation of examples of JS encapsulation of animate motion framework

小云云Original: 2018-01-24 15:48:431532browse

This article mainly brings you an example of native JS encapsulating the animate motion framework. The editor thinks it is quite good, so I will share it with you now and give it as a reference for everyone. Let’s follow the editor to take a look, I hope it can help everyone.

is as follows:

<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
<style>
p {
width: 100px;
height: 100px;
background-color: pink;
position: absolute;
left: 0;
top: 50px;
border-radius: 50%;
}
</style>
</head>
<body>
<button id="btn200">200</button>
<button id="btn400">400</button>
<p id="box"></p>
</body>
</html>
<script>
var btn200 = document.getElementById("btn200");
var btn400 = document.getElementById("btn400");
var box = document.getElementById("box");
btn200.onclick = function() {
animate(box,{width: 200, top: 100,left: 200,opacity:40,zIndex:3},function(){alert("我来了")});
}
btn400.onclick = function() {
animate(box,{top:500,opacity:10});
}
// 多个属性运动框架 添加回调函数
function animate(obj,json,fn) { // 给谁 json
clearInterval(obj.timer);
obj.timer = setInterval(function() {
var flag = true; // 用来判断是否停止定时器 一定写到遍历的外面
for(var attr in json){ // attr 属性 json[attr] 值
//开始遍历 json
// 计算步长 用 target 位置 减去当前的位置 除以 10
// console.log(attr);
var current = 0;
if(attr == "opacity")
{
current = Math.round(parseInt(getStyle(obj,attr)*100)) || 0;
console.log(current);
}
else
{
current = parseInt(getStyle(obj,attr)); // 数值
}
// console.log(current);
// 目标位置就是 属性值
var step = ( json[attr] - current) / 10; // 步长 用目标位置 - 现在的位置 / 10
step = step > 0 ? Math.ceil(step) : Math.floor(step);
//判断透明度
if(attr == "opacity") // 判断用户有没有输入 opacity
{
if("opacity" in obj.style) // 判断 我们浏览器是否支持opacity
{
// obj.style.opacity
obj.style.opacity = (current + step) /100;
}
else
{ // obj.style.filter = alpha(opacity = 30)
obj.style.filter = "alpha(opacity = "+(current + step)* 10+")";

}
}
else if(attr == "zIndex")
{
obj.style.zIndex = json[attr];
}
else
{
obj.style[attr] = current + step + "px" ;
}

if(current != json[attr]) // 只要其中一个不满足条件 就不应该停止定时器 这句一定遍历里面
{
flag = false;
}
}
if(flag) // 用于判断定时器的条件
{
clearInterval(obj.timer);
//alert("ok了");
if(fn) // 很简单 当定时器停止了。 动画就结束了 如果有回调，就应该执行回调
{
fn(); // 函数名 + （） 调用函数 执行函数
}
}
},30)
}
function getStyle(obj,attr) { // 谁的 那个属性
if(obj.currentStyle) // ie 等
{
return obj.currentStyle[attr]; // 返回传递过来的某个属性
}
else
{
return window.getComputedStyle(obj,null)[attr]; // w3c 浏览器
}
}
</script>

Related recommendations:

JS implements jQuery's animate() animation

jquery animate animation continuous movement example

css animation production—— CSS animate

The above is the detailed content of Detailed explanation of examples of JS encapsulation of animate motion framework. For more information, please follow other related articles on the PHP Chinese website!

jquery css 封装 JS

Statement：

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Previous article：Detailed explanation of the use of innerWidth and innerHeight in JavaScriptNext article：Detailed explanation of the use of innerWidth and innerHeight in JavaScript

See more

Detailed explanation of examples of JS encapsulation of animate motion framework

Related articles