循环中的Javascript动态变量名

Question

我不知道如何在JS中使用动态变量。我有一个滚动条列表，一些余额关联，我想在我的循环中动态显示每个‘平衡贴纸’。但是它似乎根本没有使用我添加到变量中的append？

var ticker = [CURRENCY1,CURRENCY2,CURRENCY3];
var balancesCURRENCY1 = 20;
var balancesCURRENCY2 = 30;
var balancesCURRENCY3 = 40;

for (var tick in ticker) {

  if (('balances'+ticker[tick]) != 0) {
    console.log(true);
  }     

}

Answer 1

要使用动态变量，请将variableNames保留在对象中，无论何时动态创建变量名称，都要引用该对象以获取变量的值。

var ticker = ['CURRENCY1','CURRENCY2','CURRENCY3'];
 
var allBalances = {
  balancesCURRENCY1 : 20,
  balancesCURRENCY2 : 30,
  balancesCURRENCY3 : 40

}

for (var tick in ticker) {

  if (allBalances['balances'+ticker[tick]] != 0) {
    console.log(true);
  }     

}

​

Answer 2

首先，您必须在数组中引用名称：[CURRENCY1,CURRENCY2,CURRENCY3]，否则它们将被作为变量处理。

然后，您可以从this访问您的动态名称，请参阅以下代码片段：

​

var ticker = ['CURRENCY1', 'CURRENCY2', 'CURRENCY3'];
var balancesCURRENCY1 = 20;
var balancesCURRENCY2 = 30;
var balancesCURRENCY3 = 40;

for (var tick in ticker) {

  if (this['balances'+ticker[tick]] != 0) {
    console.log(
      ticker[tick], 
      'balances'+ticker[tick] + ' = ' + this['balances'+ticker[tick]],
      true
    );
  }     

}

​

Answer 3

维护2个并行数组会更干净

var ticker = ['CURRENCY1','CURRENCY2','CURRENCY3'];
var balances = [20, 30, 40];

或对象数组：

var tickerInfo = [
  {currency: 'CURRENCY1', balance: 20},
  {currency: 'CURRENCY2', balance: 30},
  {currency: 'CURRENCY3', balance: 40},
];