Whether the array length can be changed in JavaScript
This article mainly introduces whether the length of the array in JavaScript can be changed, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to understand it.
JavaScript array length can be changed, methods: 1, by changing the value of the array length attribute to change the array length, syntax "arr.length= length value"; 2, the use of unshift (), shift (), splice () and other methods to add or delete array elements to change the array length.
The operating environment of this tutorial: windows7 system, javascript1.8.5 version, Dell G3 computer.
The array length in JavaScript can be changed.
The length attribute of the JavaScript array is variable, and we can change the length of the array by changing the value of the length attribute.
Var arr=; / / an array containing 8 values arr [xss_clean] (arr.length); / / displays the array length 8arr.array 10; / / increases the length of the array [xss_clean] (arr.length); / / the array length has changed to 10.
Also, the length of the array changes as the element increases or decreases. Example:
Var arr= [98 arr.length 76]; / / Array containing 5 values [xss_clean] (arr.length); / / display array length 5arr [15] = 34; / / add elements, use index 15, assign to 34alert (arr.length); / / display array length 16
We can use push (), pop (), unshift (), shift (), splice () and other methods to add or remove array elements to change the array length. Example:
Var arr = [0]; / / define the array console.log (arr.length); arr.unshift (1Power2); / / add two elements at once console.log (arr.length); arr.shift (0); / / delete 1 element console.log (arr.length)
Output result:
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