Javascript 从json中删除特定元素

我有

json

like

{
  "type": "textbox",
  "originX": "center",
  "originY": "top",
  "left": 1289.6,
  "top": 695.43,
  "width": 244.84,
  "height": 36.72,
  "fill": "rgb(0, 0, 0)",
  "stroke": null,
  "strokeWidth": 1,
  "strokeDashArray": null,
  "strokeLineCap": "butt",
  "strokeLineJoin": "miter",
  "strokeMiterLimit": 10,
  "scaleX": 1,
  "scaleY": 1,
  "angle": 0,
  "flipX": false,
  "flipY": false,
  "opacity": 1,
  "shadow": null,
  "visible": true,
  "clipTo": null,
  "backgroundColor": "",
  "fillRule": "nonzero",
  "globalCompositeOperation": "source-over",
  "transformMatrix": null,
  "lockMovementX": false,
  "lockMovementY": false,
  "evented": true,
  "text": "FROM ONLY £199",
  "fontSize": 25,
  "fontWeight": "",
  "fontFamily": "'trebuchet ms'",
  "fontStyle": "",
  "lineHeight": 1.3,
  "textDecoration": "",
  "textAlign": "left",
  "textBackgroundColor": "",
  "styles": {
     "0": {
       "1": {
        "fontFamily": "'trebuchet ms'",
        "fontSize": 25,
        "fontWeight": "",
        "fontStyle": ""
      },
      "2": {
        "fontFamily": "'trebuchet ms'",
        "fontSize": 25,
        "fontWeight": "",
        "fontStyle": ""
      }
    }
  },
  "minWidth": 20
}

您可以在最后一秒看到

styles

属性，它有许多其他对象。当您从中打开一个时，您将看到

fontFamily

，

fontSize

fontWeight

。我想从中删除

fontWeight

。为此，我尝试了这个代码

if (typeof indexs['styles'] != "undefined") {
    for (rowIndex in indexs['styles']) {
        for (letterIndex in indexs['styles'][rowIndex]) {
           if (indexs['styles'][rowIndex][letterIndex].fontWeight && indexs['styles'][rowIndex][letterIndex].fontWeight=='') {
               delete indexs['styles'][rowIndex][letterIndex]['fontWeight'];
            }
        }
    }   
}

---

但不删除该属性。我做错什么了吗？

您必须更新以下内容：

if (indexs['styles'][rowIndex][letterIndex].fontWeight=='') {
    delete indexs['styles'][rowIndex][letterIndex]['fontWeight'];
}

因为空白值

“

是错误的值

indexs['styles'][rowIndex][letterIndex].fontWeight

---

当

为真时，
为假
和
为假
的结果应起作用
也尝试此操作…在检查空值之前检查键“fontWeight”是否存在

if (typeof indexs['styles'] != "undefined") {
    for (rowIndex in indexs['styles']) {
        for (letterIndex in indexs['styles'][rowIndex]) {
           if (indexs['styles'][rowIndex][letterIndex].hasOwnProperty("fontWeight") && indexs['styles'][rowIndex][letterIndex].fontWeight=='') {
               delete indexs['styles'][rowIndex][letterIndex]['fontWeight'];
            }
        }
    }   
}
});

不要链接到内容，请将其包含在问题中（可能重复）。你也可以检查一下：@SampoSarrala我试过那个代码，但对我不起作用，这就是为什么我在这里发布这个问题。同样，不要链接到内容-在@Amit no content中阅读所有关于它的内容。现在想象