如何用js编写一个fadein、fadeout函数？
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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width,initial-scale=1.0,maximum=1.0,minimum=1.0,user-scalable=0" />
</head>
<body>
<div id="picker">
<img src="//repo.bfw.wiki/bfwrepo/image/5d65ea7d8bc8b.png?x-oss-process=image/auto-orient,1/resize,m_fill,w_300,h_300,/quality,q_90" />
</div>
<script type="text/javascript">
// Fade in
var fadeIn = function(el) {
el.style.opacity = 0;
var last = +n...点击查看剩余70%
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