參考自:?https://love2dev.com/blog/javascript-remove-from-array/

1.?Removing Elements from End of Array

var ar = [1, 2, 3, 4, 5, 6]; ar.length = 4; // set length to remove elements console.log( ar ); // [1, 2, 3, 4]var ar = [1, 2, 3, 4, 5, 6]; ar.pop(); // returns 6 console.log( ar ); // [1, 2, 3, 4, 5]

2.?Removing Elements from Beginning of Array

var ar = ['zero', 'one', 'two', 'three']; ar.shift(); // returns "zero" console.log( ar ); // ["one", "two", "three"]

3.?Using Splice to Remove Array Elements

var arr = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0]; var removed = arr.splice(2,2);/* removed === [3, 4] arr === [1, 2, 5, 6, 7, 8, 9, 0] */ ["bar", "baz", "foo", "qux"]list.splice(0, 2) // Starting at index position 0, remove two elements ["bar", "baz"] and retains ["foo", "qux"].

4.?Removing Array Items By Value Using Splice

var arr = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0];for( var i = 0; i < arr.length; i++){ if ( arr[i] === 5) {arr.splice(i, 1); } }//=> [1, 2, 3, 4, 6, 7, 8, 9, 0]

5.?Using the Array filter Method to Remove Items By Value

var array = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0];var filtered = array.filter(function(value, index, arr){return value > 5;});//filtered => [6, 7, 8, 9] //array => [1, 2, 3, 4, 5, 6, 7, 8, 9, 0]

6.?The Lodash Array Remove Method

var array = [1, 2, 3, 4]; var evens = _.remove(array, function(n) {return n % 2 === 0; });console.log(array); // => [1, 3] console.log(evens); // => [2, 4]

7.?Making a Remove Method

function arrayRemove(arr, value) {return arr.filter(function(ele){return ele != value;});}var result = arrayRemove(array, 6);// result = [1, 2, 3, 4, 5, 7, 8, 9, 0]

8.?Explicitly Remove Array Elements Using the Delete Operator

var ar = [1, 2, 3, 4, 5, 6]; delete ar[4]; // delete element with index 4 console.log( ar ); // [1, 2, 3, 4, undefined, 6] alert( ar ); // 1,2,3,4,,6

9.?Clear or Reset a JavaScript Array

var ar = [1, 2, 3, 4, 5, 6]; //do stuff ar = []; //a new, empty array!var arr1 = [1, 2, 3, 4, 5, 6]; var arr2 = arr1; // Reference arr1 by another variable arr1 = []; console.log(arr2); // Output [1, 2, 3, 4, 5, 6]var ar = [1, 2, 3, 4, 5, 6]; console.log(ar); // Output [1, 2, 3, 4, 5, 6] ar.length = 0; console.log(ar); // Output []var ar = [1, 2, 3, 4, 5, 6]; console.log(ar); // Output [1, 2, 3, 4, 5, 6] ar.splice(0, ar.length); console.log(ar); // Output []var ar = [1, 2, 3, 4, 5, 6]; console.log(ar); // Output [1, 2, 3, 4, 5, 6]while (ar.length) {ar.pop();} console.log(ar); // Output []

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轉載于:https://www.cnblogs.com/sipher/p/11563975.html

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