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js奇偶数判断的代码

有两个变量 a 和 b

　　如果a=1,3,5,7,9 则b="奇数"

　　如果a=2,4,6,8 则b="偶数"

　　如果a="0" 则b="零"

　　

<img src="/_New/_cj/myeditor/sysimage/space.gif" class="ewebeditor__script" _ewebeditor_fake_tag="script" _ewebeditor_fake_value="%3CScript%20language%3D%22JavaScript%22%20type%3D%22text%2Fjavascript%22%3E%20%0D%0A%3C!--%20%0D%0Afunction%20chk(num)%7B%20%0D%0A%20%20return%20num%3Fnum%252%3F%22%E5%A5%87%E6%95%B0%22%3A%22%E5%81%B6%E6%95%B0%22%3A%220%22%20%0D%0A%7D%20%0D%0A%0D%0Afunction%20show(num)%7B%20%0D%0A%20%20if(num%3D%3D%22%22)%20%7Balert(%22%E6%B2%A1%E6%9C%89%E5%A1%AB%E5%86%99%E6%95%B0%E5%AD%97!%22)%3Breturn%20false%3B%7D%20%0D%0A%20%20if(isNaN(num))%20%7Balert(%22%E9%9D%9E%E6%95%B0%E5%AD%97!%22)%3Breturn%20false%3B%7D%20%0D%0A%20%20if(num%3E9)%7Balert(%22%E5%A4%A7%E4%BA%8E9%E8%A2%AB%E5%BC%BA%E8%A1%8C%E6%94%B9%E4%B8%BA1%22)%3Balert(chk(1))%3B%7Delse%20if(num%3C0)%7Balert(%22%E5%B0%8F%E4%BA%8E0%E8%A2%AB%E5%BC%BA%E8%A1%8C%E6%94%B9%E4%B8%BA0%22)%3Balert(chk(0))%3B%7Delse%20if(num%3D%3D0)%7Balert(chk(0))%3B%7Delse%7Balert(chk(num))%7D%20%0D%0A%7D%20%0D%0A%2F%2F--%3E%20%0D%0A%3C%2FScript%3E"> 
<form name="abc"> 
<input name="num" id="num" type="text" value=""/> 
<input name="chk" id="chk" type="button" value="检查" onclick="show(this.form.num.value)"/ > 
</form>

　　 [Ctrl+A 全选注:如需引入外部Js需刷新才能执行]

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