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- <!DOCTYPE html>
- <html lang="en">
- <head>
- <meta charset="UTF-8">
- <meta name="viewport" content="width=device-width, initial-scale=1.0">
- <title>Document</title>
- </head>
- <body>
- <div class="box">你好世界</div>
- <div class="btn">按钮</div>
- <script>
- var oBox = document.getElementsByClassName("box")[0];
- var oBtn = document.getElementsByClassName("btn")[0];
- oBtn.onclick = function(){
- oBox.innerText += "hello world";
- console.log(oBox.innerText);
- // oBox.innerHTML = "<h1>hello world</h1>"
- }
- </script>
- </body>
- </html>
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