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>