摘要：
var email=prompt("输入邮箱格式");var str=email.lastIndexOf(".");var str2=email.substring(str);//.com/.cnvar str3=email.indexOf("@");var str4=email.substring 阅读全文
摘要：
var arr=["a","b","c","d","c","b","d","f"];var newarr=[];//存放不重复元素的数组var count=[];//记录重复元素的元素和索引值for(var i=0;i<arr.length;i++){ var type=true; for(var 阅读全文