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<!DOCTYPE html> <html> <head> <style> #myDIV { height: 250px; width: 400px; padding: 10px; margin: 15px; border-left: 10px solid red; background-color: lightblue; direction: rtl; overflow: scroll; } </style> </head> <body> <p>单击按钮以获取 div 左边框的宽度，以像素为单位。</p> <button onclick="myFunction()">试一试</button> <div id="myDIV"> 此 div 的文本方向是从右到左。<br> 它有一个滚动条！ <p id="demo"></p> </div> <script> function myFunction() { var left = document.getElementById("myDIV").clientLeft; document.getElementById("demo").innerHTML = "左边框宽度：" + left + "px"; } </script> </body> </html>