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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<script>
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var b1=new Boolean(0);
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var b2=new Boolean(1);
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var b3=new Boolean("");
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var b4=new Boolean(null);
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var b5=new Boolean(NaN);
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var b6=new Boolean("false");
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document.write("0 is boolean "+ b1 +"<br>");
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document.write("1 is boolean "+ b2 +"<br>");
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document.write("An empty string is boolean "+ b3 + "<br>");
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document.write("null is boolean "+ b4+ "<br>");
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document.write("NaN is boolean "+ b5 +"<br>");
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document.write("The string 'false' is boolean "+ b6 +"<br>");
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</script>
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</body>
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</html>