JavaScript實作找出字串中第一個不重複的字元_javascript技巧

此演算法僅供參考，小菜基本上不懂高深的演算法，只能用最樸實的思想去表達。

//找出字符串中第一个不重复的字符
// firstUniqueChar("vdctdvc"); --> t
function firstUniqueChar(str){
var str = str || "",
i = 0,
k = "",
_char = "",
charMap = {},
result = {name: "",index: str.length};

for(i=0;i<str.length;i++){
_char = str.charAt(i);
if(charMap[_char] != undefined){
charMap[_char] = -1;
}else{
charMap[_char] = i;
}
}

for(k in charMap){
if(charMap[k]<0){
continue;
}
if(result.index>charMap[k]){
result.index = charMap[k];
result.name = k;
}
}

return result.name;
}