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<p>点击菜单按钮变为 "X":</p>
<div class="container" onclick="myFunction(this)">
<div class="bar1"></div>
<div class="bar2"></div>
<div class="bar3"></div>
</div>
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function myFunction(x) {
x.classList.toggle("change");
}
.container {
display: inline-block;
cursor: pointer;
.bar1, .bar2, .bar3 {
width: 35px;
height: 5px;
background-color: #333;
margin: 6px 0;
transition: 0.4s;
.change .bar1 {
-webkit-transform: rotate(-45deg) translate(-9px, 6px) ;
transform: rotate(-45deg) translate(-9px, 6px) ;
.change .bar2 {opacity: 0;}
.change .bar3 {
-webkit-transform: rotate(45deg) translate(-8px, -8px) ;
transform: rotate(45deg) translate(-8px, -8px) ;