js 判断数组中指定元素出现的次数

Posted 2020-09-18

function arrCheck(arr,c){
var newArr = [];
var temp = c;
for(var i=0;i<arr.length;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 count;
}
}
};

console.log(arrCheck([1,2,3,3,4],3));