<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> </head> <body> <script type="text/javascript"> var a=1; var b="呵呵"; var c=function myf(){}; //强转 var a_qzh=a.toString(); var b_qzh=Number(a); document.write( "var a=1的数据类型是:"+ typeof a+"<br />"+ "var b='呵呵'的数据类型是:"+ typeof b+"<br />"+ "var c=function myf(){};的数据类型是:"+ typeof c+"<br />"+ "-------------以下是经过强转了的结果-------------"+"<br />"+ "a强转后的结果是:"+typeof a_qzh+"<br />"+ "b强转后的结果是:"+typeof b_qzh+"<br />" ); </script> </body> </html>