Question

我正在寻找一种从其他变量中读取变量txt的方法，这些变量基本上来自这样的计数器。

示例：

var txt0 = "this is txt 0"
var txt1 = "this is txt 1"
var txt2 = "this is txt 2"

counter = 0 // 1,2 or 3 etc
var a = (var+counter);  // this line output : var0;or var3 etc
$(h1').text(a);
console.log(a);
//answer I want is : this is text 0 or 1 or 2;

我尝试创建一个基本示例来演示我的问题，我需要使用这种格式，因为很多其他代码依赖于计数器的动态各种检查其他内容

Answer 1

您使用以下代码执行此操作：var a = window['txt'+counter];

var txt0 = "this is txt 0"
var txt1 = "this is txt 1"
var txt2 = "this is txt 2"

counter = 0; // 1,2 or 3 etc
var a = window['txt'+counter];
$('h1').text(a);
console.log(a);

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<h1></h1>

但是当然使用数组或JSON对象会更有效率

Answer 2

您可以使用window

进行访问

var a = window["var"+counter];  // this line output : var0;or var3 etc

但你应该使用数组或JOSN对象

var obj = {txt0 :"this is txt 0", txt1: "this is txt 1", txt2 = "this is txt 2"}

和访问类似

obj["var"+counter]

Answer 3

var txt = ["this is text 0", "this is text 1", "this is text 2"];

var counter = 0;
/* You should make sure counter is within [0; txt.length - 1 ] */
$('h1').text(txt[counter]);

Jquery / Js Variable Plus可变输出文本

3 个答案: