如何使用forEach循環添加Json項目？

Question

這是GoJS（圖表化）項目的一部分，「屬性」是itemArray，它是在圖表中的一個節點內部定義的。

1）這工作（硬編碼值）：

properties: [ 
    { "property_name": "Prop1", "property_value": "100"}, 
    { "property_name": "Prop2", "property_value": "101" }, 
    { "property_name": "Prop3", "property_value": "102" } 
] 

2）該不工作（從數據源）：

properties: [ 
    data.ObjectPropertiesList.forEach(function (item, i) { 
     properties.push({ "property_name": item.Item1.toString(), "property_value": item.Item2.toString() }); 
    }) 
] 

2.1）同周圍的代碼：

myPalette.model = new go.GraphLinksModel([ 
    { key: "B", text: "some block", color: "blue" }, 
    { key: "G", text: "Macro", isGroup: true }, 
    { category: "circle", key: "Gc", text: "A", color: "black", group: "G", loc: "0 0" }, 
    { 
     category: "table", key: "Ga", group: "G", loc: "60 0", 
     properties: [ 
      data.ObjectPropertiesList.forEach(function (item, i) { 
       properties.push({ "property_name": item.Item1.toString(), "property_value": item.Item2.toString() }); 
      }) 
     ] 
    } 
], [ 
    { from: "Gc", to: "Ga" } 
]); 

Answer 1

不要使用forEach當y ou want map：

properties: data.ObjectPropertiesList.map(function (item) { 
    return { "property_name": item.Item1.toString(), "property_value": item.Item2.toString() }; 
}) 

Answer 2

var properties = []; 
for(var i=0; i < data.length; i++){ 
    var item = data[i]; 
    properties.push({ 
     "property_name": item.Item1.toString(), 
     "property_value": item.Item2.toString() 
    }) 
} 

Answer 3

爲什麼要在var聲明中推送數據？剛剛宣佈你的數組，然後將值，請參見下面的代碼片段工作

var data= {}; 
 
    data.ObjectPropertiesList = [ 
 
    {Item1:"Prop1",Item2:"100"}, 
 
    {Item1:"Prop2",Item2:"101"}, 
 
    {Item1:"Prop3",Item2:"102"}, 
 
] 
 

 
properties = []; 
 

 
data.ObjectPropertiesList.forEach(function (item, i) { 
 
    properties.push({ "property_name": item.Item1.toString(), "property_value": item.Item2.toString() }); 
 
}) 
 

 
console.log(properties);