LeetCode力扣 38. 外观数列 Count and Say 题解代码 JavaScript

​​https://leetcode-cn.com/problems/count-and-say/​​

/**
 * @param {number} n
 * @return {string}
 */
var countAndSay = function(n) {
    var s = "1" ,i,j, str;
    var t1,ts;
    for(i=1;i<n;++i) {
        t1 = 1;
        ts = s[0];
        str = "";
        for(j=1;j<s.length;++j) {
            if(ts == s[j]) {
                ++t1;
                continue;
            }
            str += t1 + ts;
            ts = s[j];
            t1 = 1;
        }
        str += t1 + ts;
        s = str;
    }
    return s;
};