var str ="abcabcaaaaa";
var map = {}; for(var i = 0;i<str.length;i++){ var s = str[i]; var r = map[s]; if(r){ map[s] +=1; }else{ map[s] = 1; } }console.log(JSON.stringify(map));输出结果:{"a":7,"b":2,"c":2}本文共 300 字,大约阅读时间需要 1 分钟。
var str ="abcabcaaaaa";
var map = {}; for(var i = 0;i<str.length;i++){ var s = str[i]; var r = map[s]; if(r){ map[s] +=1; }else{ map[s] = 1; } }console.log(JSON.stringify(map));输出结果:{"a":7,"b":2,"c":2}转载于:https://www.cnblogs.com/wgy0528/p/10600773.html