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There are a few ways to remove a specific item from an array in JavaScript. Here are a few methods that you can use:

1. The Array.prototype.splice() method can be used to remove an item from an array by specifying the index of the item and the number of items to remove. Here is an example of how you can use splice() to remove the item at index 2 from an array:

var numbers = [1, 2, 3, 4, 5];
numbers.splice(2, 1); 
console.log(numbers); // output: [1, 2, 4, 5]

2. The Array.prototype.filter() method can be used to create a new array with all elements that pass the test implemented by the provided function. Here’s an example of how you can use filter to remove a specific number from an array:

var numbers = [1, 2, 3, 4, 5];
numbers = numbers.filter(function(num) { return num !== 3 });
console.log(numbers); // output: [1, 2, 4, 5]

3. You can use Array.prototype.indexOf() method to find the index of the desired item and then use Array.prototype.slice() to remove that element.

var numbers = [1, 2, 3, 4, 5];
var index = numbers.indexOf(3);
if (index > -1) {
  numbers = numbers.slice(0, index).concat(numbers.slice(index + 1));
}
console.log(numbers); // output: [1, 2, 4, 5]

4. You can also use the Array.prototype.findIndex() to find the index of the item and Array.prototype.splice() to remove the specific item.

var numbers = [1, 2, 3, 4, 5];
var index = numbers.findIndex(num => num === 3);
if (index !== -1) numbers.splice(index, 1);
console.log(numbers); // output: [1, 2, 4, 5]

All of the above methods will remove the specific item from the array, and return the modified array.

It’s important to note that the splice() method modifies the original array, while filter and slice returns new array.

Also, if you are trying to remove multiple elements from an array, you can use these methods multiple times or use nested looping to remove those elements.