通过key-value形式的对象存储字符串及字符串出现的次数:
function getStr(str) {
var strObj = {};
var maxStr = '';
var maxCount = 0;
for (var i = 0; i<str.length; i++) {
if (!strObj[str.charAt(i)]) {
strObj[str.charAt(i)] = 1;
} else {
strObj[str.charAt(i)] ++;
}
}
for(var key in strObj) {
if (strObj[key] > maxCount) {
maxStr = key;
maxCount = strObj[key];
}
}
console.log(maxStr, maxCount)
}
先给字符串排序,通过lastIndexOf()获取当前字符最后出现的位置得到当前字符的长度:
function getStr(str) {
str = str.split('').sort().join('');
var maxStr = '';
var maxCount = 0;
for (var i =0; i<str.length; i++) {
var char = str[i];
var charCount = str.lastIndexOf(char) - i +1;
if (charCount > maxCount) {
maxCount = charCount;
maxStr = char;
}
i = str.lastIndexOf(char);
}
console.log(maxStr, maxCount)
}