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<p id="demo">单击按钮创建有文本的按钮</p>
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<button onclick="myFunction()">点我</button>
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<script>
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function myFunction() {
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var btn = document.createElement("BUTTON");
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var t = document.createTextNode("CLICK ME");
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btn.appendChild(t);
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document.body.appendChild(btn);
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};
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</script>