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<!DOCTYPE html> <html> <body> <form id="myCarForm"> 最喜欢的车：<input type="text" name="fname" value="Volvo"> </form> <form id="myColorForm"> 最喜欢的颜色：<input type="text" name="favcolor" value="Blue"> </form> <p>单击按钮显示 id="myForm" 的表单元素的 HTML 内容。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var x = document.forms.namedItem("myCarForm").innerHTML; document.getElementById("demo").innerHTML = x; } </script> </body> </html>