为什么打印出来的是这个["[object Object]"] 而不是数组对象呢

[
    {
        adminSysId: "874b97a15c5b45e2af02c8b3a26db49d",
        roleName: "项目试用人员"
    },
    {
        adminSysId: "822307a15c5b45e2af02c8b3a26db49d",
        roleName: "运营"
    },
    {
        adminSysId: "962307a15c5b45e2af02c8b3a26db49d",
        roleName: "系统"
    }
]
<checkbox-group bindchange="Select" class="content">
        <checkbox class="item" wx:for="{{list}}" value="{{item}}">
            {{item.roleName}}
        </checkbox>
</checkbox-group>

Select(e){
    console.log(e.detail.value)
},