例如页面里面
var goods_json = app.globalData.goods_json
之后，页面的goods_json内的数量随着用户选择更改后，再打印app.globalData.goods_json的内容也是跟着变的，所以不解的是这个数值传递到底是怎么个逻辑，谢谢
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- project.miniapp.json#II. SDK version: Mini Program/Development/Extended/Must Read Before Development/project.miniapp.json
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JS对象深拷贝，了解一下。