编辑下面的代码:【加编码】
<html> <body> <script> var b1=new Boolean(0); var b2=new Boolean(1); var b3=new Boolean(""); var b4=new Boolean(null); var b5=new Boolean(NaN); var b6=new Boolean("false"); document.write("0 is boolean "+ b1 +"<br>"); document.write("1 is boolean "+ b2 +"<br>"); document.write("An empty string is boolean "+ b3 + "<br>"); document.write("null is boolean "+ b4+ "<br>"); document.write("NaN is boolean "+ b5 +"<br>"); document.write("The string 'false' is boolean "+ b6 +"<br>"); </script> </body> </html>
结果: 【此窗口】 帮助?
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