实例代码“Ctrl+/”提示“F11/ESC”全屏 返回 格式化 恢复 运行
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<!DOCTYPE html>
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<html>
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<body>
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​
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<p>Click the button to demonstrate line-breaks in a popup box.</p>
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​
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<button onclick="myFunction()">Try it</button>
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​
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<p id="demo"></p>
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​
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<script>
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function myFunction()
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{
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alert("Hello\nHow are you?");
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}
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</script>
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​
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</body>
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</html>