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
var input = document.getElementById("input");
var span = document.getElementById("span");
input.onchange = function(){
span.innerHTML = this.value;
}
</script>
</body>
</html>
