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                > 求字符串'gudigudigggudi'中出現次數最多字符 ~~~ var str = "gudigudigggudi"; var o = {}; for (var i = 0, length = str.length; i < length; i++) { var char = str.charAt(i); if (o[char]) { o[char]++; //次數加1 } else { o[char] = 1; //若第一次出現,次數記為1 } } console.log(o); //輸出的是完整的對象,記錄著每一個字符及其出現的次數 //遍歷對象,找到出現次數最多的字符的次數 var max = 0; for (var key in o) { if (max < o[key]) { max = o[key]; //max始終儲存次數最大的那個 } } for (var key in o) { if (o[key] == max) { //console.log(key); console.log("最多的字符是" + key); console.log("出現的次數是" + max); } } ~~~ ES6:reduce解法: ~~~ var mystring= 'gudigudigggudi'; mystring.split('').reduce(function(res, cur) { res[cur] ? res[cur] ++ : res[cur] = 1 return res; }, {}) ~~~
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