javascript - javascript / jquery 获取变量的值

Question

在javascript中，声明一个var的方法是：var msg = 'hello'，如果我现在有多个var，例如msg_1，msg_2 ... msg_n 有没有办法通过调用类似的方法来获取值

for (var i = 0; i < n; i++)
{
 var var_name = 'msg_' + i;
 alert (var_name)?
}

Answer 1

演示

for (var i = 0; i < 5; i++) {
    var var_name = 'msg_' + i;
    window[var_name] = i;
    console.log(window[var_name]);
}

Answer 2

您应该将值放在数组中。

var messages = ["first", "second", "third"];

for (var i = 0; i < n; i++)
{
    alert (messages[i])
}

Answer 3

我建议使用 toarray代替你正在做的事情。

var myVarialbes= [];
for (var i = 0; i < n; ++i) {
    myVarialbes[i] = "some stuff" + i;
}

Answer 4

Here you got a simple method:

var var_name=''; //declare variable only once
for (var i = 0; i < 5; i++) //You should change 5 to n
{
 var_name = 'msg_' + i;
 alert (var_name.split('_')[1]);
}

Answer 5

function do_test(){
    var v1 = "variable 1";
    var v2 = "variable 2";
    var v3 = "variable 3";
    for (i=1;i<4;i++){
        var o = eval("v"+i); // you actually need this
        alert (o);
    }
}

但是你为什么不使用数组呢？