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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<script>
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​
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var txt="Hello World!";
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document.write("<p>" + txt.toUpperCase() + "</p>");
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document.write("<p>" + txt.toLowerCase() + "</p>");
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document.write("<p>" + txt + "</p>");
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​
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</script>
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​
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<p>
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The methods returns a new string.
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The original string is not changed.
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</p>
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​
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</body>
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</html>
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​
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