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@@ -0,0 +1,22 @@
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+<!DOCTYPE html>
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+<html lang="en">
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+<head>
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+ <meta charset="UTF-8">
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+ <meta name="viewport" content="width=device-width, initial-scale=1.0">
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+ <title>Document</title>
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+</head>
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+<body>
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+ <div class="box">你好世界</div>
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+ <div class="btn">按钮</div>
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+ <script>
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+ var oBox = document.getElementsByClassName("box")[0];
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+ var oBtn = document.getElementsByClassName("btn")[0];
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+
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+ oBtn.onclick = function(){
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+ oBox.innerText += "hello world";
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+ console.log(oBox.innerText);
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+ // oBox.innerHTML = "<h1>hello world</h1>"
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+ }
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+ </script>
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+</body>
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+</html>
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