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<!DOCTYPE html> <html> <head> <style> #myDIV { position: absolute; width: 100px; height: 100px; background-color: coral; color: white; } </style> </head> <body> <p>单击“试一试”按钮将 DIV 元素定位到距左边缘 -30 像素的位置：</p> <p><strong>注意：</strong>如果 position 属性设置为“static”，则 left 属性无效。</p> <button onclick="myFunction()">试一试</button> <div id="myDIV"> <h1>myDIV</h1> </div> <script> function myFunction() { document.getElementById("myDIV").style.left = "-30px"; } </script> </body> </html>