Question

我正在尝试根据他们的ID添加TD元素的值。要做到这一点，我试图通过if语句传递一系列id，见下文;

var pricing = 0;
var extraLeg = 9.99;
var standardSeat = 4.99;
var upFront = 9.99;
var extraLeg1 = 13.99;

  var tds = document.getElementsByTagName("td");
  for (var T = 0; T<tds.length; T++)
  {
    if(tds[T].id == "_1a","_1f")
    {
       pricing = extraLeg1;
    }
    if(tds[T].id == "_2a","_6f")
    {
       pricing = upFront;
    }
    if(tds[T].id == "_7a","_11f")
    {
       pricing = standardSeat;
    }
    if(tds[T].id == "_12a","_13f")
    {
       pricing = extraLeg;
    }
    if(tds[T].id == "_13a","_23f")
    {
       pricing = standardSeat;
    }     
  }

表格的每一行由7个td元素组成;
＆＃34; _1a＆＃34;，＆＃34; _1b＆＃34;，＆＃34; _1c＆＃34;，＆＃34;过道编号＆＃34;，＆＃34; _1d＆＃34;，＆＃34; _1e＆＃34;＆＃34; _1f＆＃34;

然而，当我尝试这个时，点击的第一个元素设置了所有其他元素的价格，尽管有for循环。谁能告诉我如何解决这个问题，以便为td分配特定值？

提前致谢

Answer 1

您进行的比较不正确。

应该是这样的：

if(tds[T].id == "_13a" || tds[T].id == "_23f")

在您的代码中，表达式tds[T].id == "_13a","_23f"的计算结果为＆＃34; _23f＆＃34;由于逗号，因为它变得真实，所有if条件都会被执行。

您可以在控制台中查看此内容：console.log((2 == 3, "_23f"));

也就是说，您应该考虑使用Switch块来更好地呈现代码并使未来的更改更容易。

  var pricing = 0;
  var extraLeg = 9.99;
  var standardSeat = 4.99;
  var upFront = 9.99;
  var extraLeg1 = 13.99;

  var tds = document.getElementsByTagName("td");
  for (var T = 0; T<tds.length; T++)
  {
      switch (tds[T].id) {
          case "_1a":
          case "_1f":
              pricing = extraLeg1;
              break;
          case "_2a":
          case "_6f":
              pricing = upFront;
              break;
          case "_7a":
          case "_11f":
              pricing = standardSeat;
              break;
          case "_12a":
          case "_13f":
              pricing = extraLeg;
              break;
          case "_13a":
          case "_23f":
              pricing = standardSeat;
              break;
      }
  }

编辑：如果你想添加更多像＆＃34; _1b＆＃34;，＆＃34; _1c＆＃34;然后，无论您的定价是相同的，您都可以将案例联合起来。例如：

switch (tds[T].id) {
      case "_1a":
      case "_1b":
      case "_1c":
      case "_1d":
      case "_1e":
      case "_1f":
          pricing = extraLeg1;
          break;
      case "_2a":
      case "_6f":
          pricing = upFront;
          break;
      case "_12a":
      case "_13f":
          pricing = extraLeg;
          break;
      case "_7a":
      case "_11f":
      case "_13a":
      case "_23f":
          pricing = standardSeat;
          break;
  }

根据TD.id设置值

1 个答案: