查询一个字符串中出现最多的一个字符

function method4_2() {var s = '111122233';for ( i = 0, z = {}; i < s.length; i++) {z[s.charAt(i)] = (z[s.charAt(i)] || 0) + 1;}t = [];for (e in z) {t[z[e]] ? t[z[e]].push(e) : (t[z[e]] = [e]);time = t.length - 1;}alert(t[time] + '出现了' + time + '次');}