Question

以下JavaScript代码可以使用，但有一种更简洁的方法可以使用 n 参数将其写入＆＃34; eval＆＃34; y 1 轴，y 2 轴，y 3 轴字段名称？

  switch (n) {
    case 1:
      markingsY = [
             { color: colorErr, y1axis: { from: maxVal } },
             { color: colorErr, y1axis: { to: minVal } },
             { color: "#00f", lineWidth: 1, y1axis: { from: minVal, to: minVal } },
             { color: "#00f", lineWidth: 1, y1axis: { from: maxVal, to: maxVal } }
          ];
    break;

    case 2:
      markingsY = [
             { color: colorErr, y2axis: { from: maxVal } },
             { color: colorErr, y2axis: { to: minVal } },
             { color: "#00f", lineWidth: 1, y2axis: { from: minVal, to: minVal } },
             { color: "#00f", lineWidth: 1, y2axis: { from: maxVal, to: maxVal } }
          ];
    break;

    case 3:
      markingsY = [
             { color: colorErr, y3axis: { from: maxVal } },
             { color: colorErr, y3axis: { to: minVal } },
             { color: "#00f", lineWidth: 1, y3axis: { from: minVal, to: minVal } },
             { color: "#00f", lineWidth: 1, y3axis: { from: maxVal, to: maxVal } }
          ];
    break;

    default:
    break;


  }

Answer 1

编辑：误读了这个问题，抱歉！

您可以使用静态密钥而不是您需要更改的密钥，然后动态更改它，以便：

markingsY = [
    { color: colorErr, yaxis: { from: maxVal } },
    { color: colorErr, yaxis: { to: minVal } },
    { color: "#00f", lineWidth: 1, yaxis: { from: minVal, to: minVal } },
    { color: "#00f", lineWidth: 1, yaxis: { from: maxVal, to: maxVal } }
];
markingsY.forEach(function(item){
    item["y"+n+"axis"]=item.yaxis;//copy it to its new key
    delete item.yaxis;//remove the old one
});

Answer 2

尝试：

var n = 10

    var collections = [];
    for(var i = 0; i < 10; i++){
        var json1 = {}
      var row = [];
      json1['color'] = '#000000';
      json1['y'+i+'axis'] = {from: 1234};
      row.push(json1);
      collections.push(row);
    }

    console.log(collections);

您将拥有10个markingsY数组的集合。每个markingsY数组都有（我的代码）1 JSON

collections = [ 
    [{color:#0000000, y0axis:{form:1234}}], 
    [{color:#0000000, y1axis:{form:1234}}] 
.....];

然后可以更换开关（n）：

collections[n]

https://jsfiddle.net/kingychiu/ow1e3h4x/

我可以使用参数来定义字段名称

2 个答案: