本文介绍了什么是之间和QUOT的差异;数组()"和" []"同时声明一个JavaScript数组?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
有什么声明的真正区别是这样一个数组:
What's the real difference between declaring an array like this:
var myArray = new Array();
和
var myArray = [];
推荐答案
有是有区别的,但是在该示例中没有差异。
There is a difference, but there is no difference in that example.
使用了更详细的方法:新的Array()
确实有在参数中的一个额外的选项:如果你传递一个数字来构造函数,你会得到一个数组该长度:
Using the more verbose method: new Array()
does have one extra option in the parameters: if you pass a number to the constructor, you will get an array of that length:
x = new Array(5);
alert(x.length); // 5
要说明不同的方法来创建一个数组:
To illustrate the different ways to create an array:
var a = [], // these are the same
b = new Array(), // a and b are arrays with length 0
c = ['foo', 'bar'], // these are the same
d = new Array('foo', 'bar'), // c and d are arrays with 2 strings
// these are different:
e = [3] // e.length == 1, e[0] == 3
f = new Array(3), // f.length == 3, f[0] == undefined
;
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