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>
该题主要考察的是单向绑定：DOM 可以首先使用 getElementById 获取id = “input”如果改变onchange 获取到的值 再赋值给id= “span”，document.getElementById("span").innerHTML = this.value
