版本1.0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
var str = 'zajkdhgajskdhu';
function returnFirstStr (str) {
var strArr = str.split('');
var len = strArr.length;
var arr = [];
var obj = {};
for(var i = 0;i < len; i++) {
if(!obj[strArr[i]]) {
obj[strArr[i]] = 1;
arr.push(strArr[i]);
}else {
obj[strArr[i]] += 1;
}
}
var len1 = arr.length;
for(var j = 0; j < len1;j++) {
if(obj[arr[j]] == 1) {
return arr[j];
}
}
return 'cant find'
}
console.log(returnFirstStr(str));
版本2.0 我这么感觉这两个都写得很蠢呢
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
var str = 'zajkdhgajskdhu';
function returnFirstStr (str) {
var strArr = str.split('');
var arr = [];
var obj = {};
strArr.forEach(function (item) {
if(!obj[item]) {
obj[item] = 1;
arr.push(item);
} else {
obj[item] += 1;
}
})
var result;
arr.forEach(function (item) {
console.log(obj[item]);
if(obj[item] == 1) {
result === undefined ? result = item : result;
}
})
return result === undefined ? 'cant find' : result;
}
console.log(returnFirstStr(str));
