<!DOCTYPE html ><html ><head><meta charset="UTF-8"><title>时间和日期</title><script>var qq="532545";if(qq.length>=5&& qq.length<=15){if(qq.charCodeAt(0)!=48){if(!isNaN(qq))alert("合法的");elsealert("含有非数字");}elsealert("以0开头,不合法");}elsealert("长度不合法")</script></head><body></body></html>
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