JavaScript怎么清空数组

[Nasuke]

let sheldon = ['c','o','o','p','e','r']
//methods 1
sheldon = []

// methods 2
sheldon.length = 0

// methods 3
sheldon.splice(0, sheldon.length)

// methods 4
while(sheldon.length > 0) sheldon.pop()

//

[ppjiucai]

// methods 1 let myArray = [1, 2, 3, 4, 5]; myArray.length = 0; console.log(myArray); // Output: [] // methods 2 let myArray = [1, 2, 3, 4, 5]; myArray.splice(0, myArray.length); console.log(myArray); // Output: [] // methods 3 arry = [1, 2, 3, 4]; arry = []; console.log(arry); //Output: [] // method 4 arry = [1, 2, 3, 4]; while (arry.length > 0) { arry.pop(); }

console.log(arry); //Output: [] // mehtod 5 arry = [1, 2, 3, 4]; while (arry.length > 0) { arry.shift(); }

console.log(arry); //Output: []

[kangkang123269]

1. 数组的length属性

   var array = [1, 2, 3];
   array.length = 0;

   2.splice方法

   var array = [1, 2, 3];
   array.splice(0,array.length);

2. 新建一个新的空数组覆盖原来的

   var array = [1, 2, 3];
   array = [];

3. shift

   var array = [1, 2, 3];
   while(array.length > 0) {
   array.shift();
   }

4. pop

   var array = [1, 2, 3];
   while(array.length > 0) {
   array.pop();
   }

5. slice

   var array = [1, 2, 3];
   array = array.slice(array.length);

6. filter

   var array = [1, 2, 3];
   // 7.1
   array = array.filter(() => false);
   // 7.2
   array = array.filter(item => item !== undefined);

7. fill

   var array = [1, 2, 3];
   array.fill(undefined);

[liliphoenix]

array.fill*()

1. 数组的length属性

var array = [1, 2, 3];
array.length = 0;

2.splice方法

var array = [1, 2, 3];
array.splice(0,array.length);

3. 新建一个新的空数组覆盖原来的

var array = [1, 2, 3];
array = [];

4. shift

var array = [1, 2, 3];
while(array.length > 0) {
    array.shift();
}

5. pop

var array = [1, 2, 3];
while(array.length > 0) {
    array.pop();
}

6. slice

var array = [1, 2, 3];
array = array.slice(array.length);

7. filter

var array = [1, 2, 3];
// 7.1
array = array.filter(() => false);
// 7.2
array = array.filter(item => item !== undefined);

8. fill

var array = [1, 2, 3];
array.fill(undefined);

array.fill(undefined)不可以吧

[ undefined, undefined, undefined ]