js数组练习题

1.将数组[12,34,2,5,76]中数字内容求和

var arr = [12,34,2,5,76];
		var sum=0;
		for (var i = 0; i < arr.length; i++) {
			sum+=arr[i];
		}

2.将数组[4, 0, 7, 9, 0, 0, 2, 6, 0, 3, 1, 0]中的0项去掉，将不为0的值存入一个新的数组

var arr = [4, 0, 7, 9, 0, 0, 2, 6, 0, 3, 1, 0];
		var newArr = [];
		for (var i = 0; i < arr.length; i++) {
			if(arr[i]!=0){
				newArr.push(arr[i]);
			}
		}

3.求[12,34,2,5,76]数组中最大值

var arr = [12,34,2,5,76];
		var max = arr[0];
		for (var i = 1; i < arr.length; i++) {
			if(max<arr[i]){
				max = arr[i];
			}
		}
		console.log(max);

 4.往数组[10,2]里面添加数据至数组的长度为5,但不要出现重复数据

var arr = [10,2];
			while(arr.length<5){
				var num = prompt('请输入任意数字')*1;
				if(isNaN(num)){
					continue;
				}else{
					if(arr.indexOf(num)==-1){
						arr.push(num);
					}else{
						continue;
					}
				}
			}
			console.log(arr);

5.[1,3,5,2,1,4,3,1,2,5,3,1,2,1]对该数组去除重复数据

var arr = [1,3,5,2,1,4,3,1,2,5,3,1,2,1];
		var newArr=[];
		for (var i = 0; i < arr.length; i++) {
			if(newArr.indexOf(arr[i])==-1){
				newArr.push(arr[i]);
			}
		}
		console.log(newArr);