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<!DOCTYPE html> <html> <body> <p>单击按钮获取测试 div 的计算背景颜色。</p> <p><button onclick="myFunction()">试一试</button></p> <div id="test" style="height: 50px;background-color: lightblue;">Test Div</div> <p>测试 div 的计算背景颜色为：<span id="demo"></span></p> <script> function myFunction(){ var elem = document.getElementById("test"); var theCSSprop = window.getComputedStyle(elem, null).getPropertyValue("background-color"); document.getElementById("demo").innerHTML = theCSSprop; } </script> </body> </html>