选择题 1.考察正则,书写一个6位数的邮箱 a var mail=/\d{6}/; b var mail=new RegExp("/\d{6}/"); 分析:对a,应该要添加开头和结尾的提示符.即:/^\d{6}$/ 2.关于Document对象 Document 对象是 Window 对象的一部分,可通过 window.document 属性对其进行访问. 3.isNaN("abc")返回true 填空题 1.考察Number类型: var a=1.6; aler…

The path to Bitcoin is littered with the corpses of failed attempts. I've compiled a list of about ahundred cryptographic payment systems, both e-cash and credit card based technologies, that arenotable in some way. Some are academic proposals that h…