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<!DOCTYPE html> <html> <body> <h3>如何访问搜索字段的演示</h3> <input type="search" id="mySearch" placeholder="搜索内容..."> <p>单击按钮获取搜索字段的占位符文本。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("mySearch").placeholder; document.getElementById("demo").innerHTML = x; } </script> </body> </html>