js实现统计字符串s1中字符连续出现个数

js实现统计字符串s1中字符连续出现个数

例如：字符串s1为aacccbbddttttggg 输出a2c3b2d2t4g3

演示：

test-v1.1.gif

代码：

        const s1 = 'qqqqwwweerrggqqwwwwmmnnn';
        let arr1 = s1.split('');
        let arr2 = [];
        let s2 = '';
        let count = 0;
        for(let i=0; i<arr1.length; i++) {
            let tmp = arr1[i];
            if(tmp === arr1[i+1]) {
                tmp = arr1[i+1];
                count ++ ;
            } else {
                count += 1;
            }
            if(tmp!==arr1[i+1] && count > 0) {
                arr2.push(tmp);
                arr2.push(count);
                count = 0;
            }
        }
        s2 = arr2.join(',');
        document.write(s2);