搜索框请输入关键字onfocus 和 onblur

code • 2022-4-12 • 随笔 • 阅读 40

搜索框请输入关键字 onfocus 和 onblur

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>Title</title>

</head>

<body>

    <div style="width: 60px; margin: 0 auto">

        <input id='i1' type="text" value="请输入内容" onfocus="Focus()" onblur="Blur()">

    </div>

    <script>

        function Focus() {

            tag = document.getElementById('i1');

            val = tag.value;

            if (val == '请输入内容') {

                tag.value = '';

            }

        }

        function Blur() {

            tag = document.getElementById('i1');

            val = tag.value;

            if (val.length==0){

                tag.value = '请输入内容';

            }

        }

    </script>

</body>

</html>