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编辑您的代码：
<!DOCTYPE html> <html> <head> <style> div { width:100px; height:50px; background:red; color:white; font-weight:bold; transition:width 2s; -moz-transition:width 2s; /* Firefox 4 */ -webkit-transition:width 2s; /* Safari and Chrome */ -o-transition:width 2s; /* Opera */ } #div1 {transition-timing-function: linear;} #div2 {transition-timing-function: ease;} #div3 {transition-timing-function: ease-in;} #div4 {transition-timing-function: ease-out;} #div5 {transition-timing-function: ease-in-out;} /* Firefox 4: */ #div1 {-moz-transition-timing-function: linear;} #div2 {-moz-transition-timing-function: ease;} #div3 {-moz-transition-timing-function: ease-in;} #div4 {-moz-transition-timing-function: ease-out;} #div5 {-moz-transition-timing-function: ease-in-out;} /* Safari and Chrome: */ #div1 {-webkit-transition-timing-function: linear;} #div2 {-webkit-transition-timing-function: ease;} #div3 {-webkit-transition-timing-function: ease-in;} #div4 {-webkit-transition-timing-function: ease-out;} #div5 {-webkit-transition-timing-function: ease-in-out;} /* Opera: */ #div1 {-o-transition-timing-function: linear;} #div2 {-o-transition-timing-function: ease;} #div3 {-o-transition-timing-function: ease-in;} #div4 {-o-transition-timing-function: ease-out;} #div5 {-o-transition-timing-function: ease-in-out;} div:hover { width:300px; } </style> </head> <body> <div id="div1" style="top:100px">linear</div> <div id="div2" style="top:150px">ease</div> <div id="div3" style="top:200px">ease-in</div> <div id="div4" style="top:250px">ease-out</div> <div id="div5" style="top:300px">ease-in-out</div> <p>请把鼠标指针移动到红色的 div 元素上，就可以看到过渡效果。</p> <p><b>注释：</b>本例在 Internet Explorer 中无效。</p> </body> </html>
查看结果: