js实现排序去重计算字符次数

    /*去重*/var arr=[1,4,4,7,3,9,0,3,2,1,"你好","你","你好","你 "];var arr2=[];for(var i=0;i<arr.length;i++){if(arr2.indexOf(arr[i])==-1){arr2.push(arr[i]);}}console.log(arr2);/*排序*/var arr=[1,4,2,8,3,0,5];var temp;for(var i=0;i<arr.length;i++){for(var j=0;j<arr.length;j++){if(arr[j]>arr[j+1]){temp=arr[j];arr[j]=arr[j+1];arr[j+1]=temp;}}}document.write('最后排序之后的结果:'+arr);/*判断数组中最多出现的字符的次数*/var s="DFSSDAFQWAWEQWS";var fres={};  //用来记录所有的字符的出现频次var mostFreqChar=''; //用来记录最大频次的字符var key;for(var i=0;i<s.length;i++){var char=s[i];if(!fres[char]){fres[char]=0;}fres[char]++;}for(key in fres){if(mostFreqChar==''||fres[key]>fres[mostFreqChar]){mostFreqChar=key;}}console.log(mostFreqChar);console.log(fres[mostFreqChar]);