题解 | #单向绑定#
单向绑定
https://www.nowcoder.com/practice/728b83e2b9b948dbababcc4a494eefc3
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<input id="input" type="text" />
<span id="span"></span>
<script type="text/javascript">
// 补全代码
let oInput = document.getElementById('input');
let oSpan = document.getElementById('span');
oInput.onchange = () => {
oSpan.innerHTML = oInput.value;
}
</script>
</body>
</html>
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