题解 | 单向绑定
单向绑定
https://www.nowcoder.com/practice/728b83e2b9b948dbababcc4a494eefc3
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
</head>
<body>
<input id="input" type="text" />
<span id="span"></span>
<script type="text/javascript">
// 补全代码
document.getElementById("input").onchange = function () {
document.getElementById("span").innerHTML = this.value;
};
</script>
</body>
</html>
