当你对一个元素进行了translateY(10px)操作，再对它进行rotateZ(45deg)操作，此时该元素的旋转中心却是以translateY之前的状态作为旋转中心，这是为什么？
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<style media="screen">
* {margin: 0; padding: 0;}
.b {
width: 50px;
height: 50px;
/*border-radius: 50%;*/
background: #000;
position: relative;
};
ul {
width: 20px;
height: 20px;
/*background: #fff;*/
position: absolute;
top: 50%;
left: 50%;
margin-top: -10px;
margin-left: -10px;
}
li {
width: 20px;
height: 2px;
background: #fff;
position: absolute;
top: 50%;
margin-top: (-1px);
transform: translateY(3.75px);
transition: all 1s;
}
li:nth-child(2) {
transform: translateY(-3.75px);
}
</style>
</head>
<body>
<div class="b">
<ul>
<li></li>
<li></li>
</ul>
</div>
</body>
<script type="text/javascript">
var b = document.querySelector('.b');
var lis = document.querySelectorAll('li');
var bol = false;
b.addEventListener('click',function(){
bol = !bol;
if(bol) {
lis[0].style.transform = 'rotateZ(45deg)';
lis[1].style.transform = 'rotateZ(-45deg)';
} else {
lis[0].style.transform = 'rotateZ(0deg)';
lis[1].style.transform = 'rotateZ(0deg)';
}
})
</script>
</html>
都写在一个transform里
var b = document.querySelector('.b'); var lis = document.querySelectorAll('li'); var bol = false; b.addEventListener('click',function(){ bol = !bol; if(bol) { lis[0].style.transform = 'rotateZ(45deg)'; lis[1].style.transform = 'rotateZ(-45deg)'; } else { lis[0].style.transform = 'translateY(3.75px) rotateZ(0deg)'; lis[1].style.transform = 'translateY(-3.75px) rotateZ(0deg)'; } })