Array.prototype.isRepeat1 = function() {
this.sort()
var result = [this[0]]
for (var i = 1 i < this.length i++) {
if (this[i] == result[result.length - 1]) {
return true
}
}
return false
}
//循环，把元素放入map中，如果在map中能找到就说明重复
Array.prototype.isRepeat2 = function() {
var map = {}, result = []
for (var i = 0 i < this.length i++) {
if (map[this[i]]) {
return true
}
map[this[i]] = true
}
return false
}
//用indexOf/lastIndexOf返回的位置比较判断是否重复
Array.prototype.isRepeat3 = function() {
for (var i = 0 i < this.length i++) {
if (this.indexOf(this[i]) != i){
return true
}
}
return false
}
var ary = new Array("111", "22", "33", "111","33")
var nary = ary.sort()
for (var i = 0i <ary.lengthi++) {
if (nary[i] == nary[i + 1]) {
alert("数组重复内容：" + nary[i])
}
}
