27. Remove Element

Given an array nums and a value val, remove all instances of that value in-place and return the new length.

Do not allocate extra space for another array, you must do this by modifying the input array in-place with O(1) extra memory.

The order of elements can be changed. It doesn't matter what you leave beyond the new length.

Example 1:

Given nums = [3,2,2,3], val = 3,

Your function should return length = 2, with the first two elements of nums being 2.

It doesn't matter what you leave beyond the returned length.

Example 2:

Given nums = [0,1,2,2,3,0,4,2], val = 2,

Your function should return length = 5, with the first five elements of nums containing 0, 1, 3, 0, and 4.

Note that the order of those five elements can be arbitrary.

It doesn't matter what values are set beyond the returned length.
题意：给定一个数字数组和目标值，将数组中所有与目标值相等的项删除，返回操作后数组的长度
代码如下：

var removeElement = function(nums, val) {
        var len=nums.length;
        for(var i=0;i<len;i++){
            if(nums[i]===val){
                nums.splice(i,1);
                len--;
                i--;
            }
        }
        return nums.length
};