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<!DOCTYPE html> <html> <body> <div id="myDiv">这是一个 div 元素</div> <br> <select onchange="myFunction(this);" size="10"> <option>none</option> <option>hidden</option> <option>点线</option> <option>虚线</option> <option>实线<</option> <option>double</option> <option>groove</option> <option>ridge</option> <option>inset</option> <option>outset</option> </select> <script> function myFunction(selectTag) { var listValue = selectTag.options[selectTag.selectedIndex].text; document.getElementById("myDiv").style.borderStyle = listValue; } </script> </body> </html>