TypeError: Cannot set property 'msg' of undefined

在axios中想把数据取出来

this. msg = “kkk”

但是却报TypeError: Cannot set property ‘msg’ of undefined的错误
后来找到，原来是自己没有函数不是箭头函数导致的
如果不是箭头函数的话，this的指向就会有问题，然后一直报错
将一下代码改为

axios.get(url).then(function(res){console.log(res.data.data.banner.list)this. msg = "你好"}).catch(function(err){console.log(err)})

改为箭头函数

axios.get(url).then(res=>{console.log(res.data.data.banner.list)this. msg = "你好"}).catch(function(err){console.log(err)})

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