​x
 
<!DOCTYPE html>
<html>
<body>
​
<h3>演示如何访问 Search 字段</h3>
​
<input type="search" id="mySearch" placeholder="搜索..">
​
<p>点击按钮来获得 search 字段的占位符文本。</p>
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<button onclick="myFunction()">试一下</button>
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<p id="demo"></p>
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<script>
function myFunction() {
    var x = document.getElementById("mySearch").placeholder;
    document.getElementById("demo").innerHTML = x;
}
</script>
​
</body>
</html>
​