通过JS动态更改div高度。高度大于限定值内容进行折叠，显示view more。点击后显示全部内容。
js代码
<html>
<body onload="queryHeight()">
<!-- div容器 -->
<div class="container">
<!-- 文本内容 高度可能为1000以上 -->
</div>
<div id="readMore" class="readMore">
<div class="readBackground"></div>
<div class="readText" onclick="show()"> Read more ∨</div>
</div>
<script>
var contentHeight = 0
function queryHeight() {
const content = document.getElementsByClassName('container')[0]
// 要获得真实高度，需用 onload 来执行方法
contentHeight = content.offsetHeight
if(content.offsetHeight > 800){
content.style.height = 800
content.style.overflow = 'hidden'
}
}
function show() {
const content = document.getElementsByClassName('container')[0]
content.style.height = contentHeight
content.style.overflow = ''
const readMore = document.getElementById('readMore')
readMore.style.display = 'none'
}
</script>
</body>
</html>
<style>
body{
margin: 0px;
width: 100%;
height: 100%;
background-color: #EFEFEF;
}
.container{
width: 100%;
height: 1500px;
background-color: #FFFFFF;
}
.td-content{
height: auto;
}
/* read-more */
.readMore{
position: absolute;
width: 100%;
height: 60px;
text-align: center;
font-size: 14px;
font-family: 'Roboto-Regular, Roboto';
font-weight: 600;
color: #000000;
line-height: 40px;
}
.readBackground{
width: 100%;
height: 20px;
background: linear-gradient(180deg, rgba(255,255,255,0) 0%, #FFFFFF 100%);
}
.readText{
background-color: #FFFFFF;
}
</style>
效果
点击前
点击后
