arrCheck(arr) {
var newArr = [];
for (var i = 0; i < arr.length; i++) {
var temp = arr[i];
var count = 0;
for (var j = 0; j < arr.length; j++) {
if (arr[j] == temp) {
count++;
arr[j] = -1;
}
}
if (temp != -1) {
newArr.push(temp + ":" + count)
}
}
return newArr;
}
原文：https://www.cnblogs.com/dujunfeng/p/9293493.html