js获取数组中相同元素数量

<script>
var array = new Array(1,2,5,1,4,4,2,3,5,1,1,5,5,5,6,7,3,9,9,10);
var arr = new Array();
var test = new Array();
var num = 1;
var temp = "";
var size = array.length;
for(var i=0;i<size; i++){
    for(var j=i+1;j<size; j++){
        if(array[i] == array[j]){
            array.splice(j,1)
            size--;
            j--;
            num ++;
        }
    }
    test[i] = num ;
    num = 1;
    arr[i] = array[i]
}
for(var i=0;i<size; i++){
    document.write("----------------------元素："+arr[i]+"个数为："+test[i]+"<br>");
}
</script>