<script>
function sort(str){
var num=0;
var element = "";
var arr=str.split("");
var obj={};
for(var i=0;i<arr.length;i++){
if(obj[arr[i]]!=null){
obj[arr[i]]++;
}else{
obj[arr[i]]=1;
}
}
for(x in obj){
if(num<obj[x]){
num=obj[x];
element = x;
}
}
console.log("重复最多的字符串："+element+"值为："+num);
return("over");
}
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