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JS 参考手册
Input Search placeholder 属性
tryjsref_search_placeholder2
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<!DOCTYPE html> <html> <body> <input type="search" id="mySearch" placeholder="Search for something.."> <p>Click the button to display the placeholder text of the search field.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("mySearch").placeholder; document.getElementById("demo").innerHTML = x; } </script> </body> </html>