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源代码：
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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>安科教程(www.ancii.com)</title> <script type="text/javascript"> function getValue(){ var a,b,c; a = void ( b = 5, c = 7 ); document.write('a = ' + a + ' b = ' + b +' c = ' + c ); } </script> </head> <body> <p>点击以下按钮查看结果：</p> <form> <input type="button" value="点我" onclick="getValue();" /> </form> </body> </html>
运行结果
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