正则的全局问题

var str = "123#abc";
var re = /abc/ig;
console.log(re.test(str)); //输出ture
console.log(re.test(str)); //输出false
console.log(re.test(str)); //输出ture
console.log(re.test(str)); //输出false

var str = "123#abc";
var re = /abc/ig;
console.log(re.test(str)); //输出ture
console.log(re.lastIndex); //输出7
console.log(re.test(str)); //输出false
console.log(re.lastIndex); //输出0
console.log(re.test(str)); //输出ture
console.log(re.lastIndex); //输出7
console.log(re.test(str)); //输出false
console.log(re.lastIndex); //输出0

　　referenece:http://www.cnblogs.com/rentj1/archive/2011/04/26/2029872.html