<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
.box {
position: relative;
width: 220px;
height: 32px;
font-size: 16px;
line-height: 16px;
}
.input {
width: 100%;
height: 100%;
padding-left: 3px;
font-size: 16px;
box-sizing: border-box;
border: 1px solid #ddd;
outline: none;
}
.place-holder {
position: absolute;
left: 3px;
top: 50%;
margin-top: -8px;
color: #999;
}
.default {
width: 220px;
height: 32px;
box-sizing: border-box;
font-size: 16px;
}
::-webkit-input-placeholder {
color: #999;
}
</style>
</head>
<body>
<div class="box">
<input type="text" class="input">
<span class="place-holder">请输入关键字</span>
</div>
<div style="margin-top: 20px;">
<input class="default" type="text" placeholder="请输入关键字">
</div>
</body>
</html>
<script>
var oSpan = document.querySelector('.place-holder');
var oInput = document.querySelector('.input');
oSpan.onclick = function() {
oInput.focus();
}
oInput.oninput = function() {
if (oInput.value) {
oSpan.style.display = 'none';
} else {
oSpan.style.display = 'inline-block';
}
}
oInput.onblur = function() {
if (oInput.value) {
oSpan.style.display = 'none';
} else {
oSpan.style.display = 'inline-block';
}
}
</script>
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