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<!DOCTYPE html> <html> <body> <h1>演示如何访问 Search 字段</h1> <input type="search" id="mySearch" placeholder="请您搜索 .."> <p>单击该按钮可获取 search 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>