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微信小程序的 tabbar icon 大小可以通过以下方式进行设置：
*
将 tabbar icon 图片制作成合适的尺寸：你可以使用设计工具（如 Photoshop、Sketch 等）将图标调整为合适的大小。通常建议使用
48x48 或 60x60 像素的图标。
*
在 app.json 文件中设置 tabbar 图标大小：在 app.json 文件的 tabBar 字段中设置 iconSize 属性，可以控制
tabbar 图标的大小。例如：
"tabBar": { "list": [ { "pagePath": "pages/home/home", "text": "首页", "iconPath"
: "images/home.png", "selectedIconPath": "images/home_selected.png", "iconSize":
48 }, { "pagePath": "pages/profile/profile", "text": "个人", "iconPath":
"images/profile.png", "selectedIconPath": "images/profile_selected.png",
"iconSize": 48 } ] }
在上面的示例中，iconSize 属性被设置为 48，这将使 tabbar 图标的大小为 48x48 像素。
微信小程序规定 tabbar icon 的尺寸不能超过 81x81
像素，否则可能会被自动缩放或裁剪。因此，建议根据实际需求和设计准则选择合适的图标大小，并进行适当的调整。
