JavaScript检索并替换字符串化JSON中的字符串部分

问题描述：

与此相比，我有一个字符串:

I have a string compared to this:

{
    "objects": [{
        "originY": "top",
        "left": 0,
        "top": 0,
        "width": 118.33,
        "height": 100,
        "name": 1
    }, {
        "originY": "top",
        "left": 0,
        "top": 0,
        "width": 118.33,
        "height": 100,
        "name": 2
    }],
    "background": ""
}

我需要循环到该字符串并检索left，top，width和height的值，然后将它们乘以一个系数，然后再次将它们另存为新字符串.

I need to loop to this string and retrieve the values of left, top, width and height and multiply them by a factor and then save them as a new string again.

关于如何实现此目标的任何想法吗?

Any idea of how I could accomplish this?

答

由于字符串是JSON，处理数据的最简单方法是将其解析为对象数组，更新值，然后将其输出为字符串再次.

Because the string is JSON, the easiest way to handle the data is to parse it into an array of objects, update the values, then output it as a string again.

// Parse
var container = JSON.parse(yourString);

// Get and update
var i, len, top, left, width, height;
len = container.objects.length;
for (i = 0; i < len; i++) {
    top = container.objects[i].top;
    left = container.objects[i].left;
    height= container.objects[i].height;
    width = container.objects[i].width;
    // * Save top, left, width somewhere. *
    // Multiply by some factor.
    container.objects[i].top *= factor;
    container.objects[i].left *= factor;
    container.objects[i].height *= factor;
    container.objects[i].width *= factor;
}

// Convert to string again.
theString = JSON.stringify(container);

JavaScript检索并替换字符串化JSON中的字符串部分

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