选项Api和组合Api的组合使用，关于变量范围的问题。Combined use of options and combinations, questions about variable scope.

[xhc-code]

Hello, about vue3+sfc
Use the option API, including the setup function. If the setup returns the value of {xxx:'Xiao Ming'} through return, it can be called through this.xxx in other life cycles.

If you use sfc syntax sugar + normal script option Api
SFC syntax sugar exposes the xxx variable through defineExpose, and cannot be called through this.xxx or xxx in the option api. Here sfc syntactic sugar and setup function have a functional deviation, am I not finding the right way?

I found out that printing this in option-style api will throw exception Cannot convert object to primitive value, with or without sfc.

1. script + setup function
2. script + sfc syntax sugar
3. Optionally print this

[xhc-code]

Hello, about vue3+sfc Use the option API, including the setup function. If the setup returns the value of {xxx:'Xiao Ming'} through return, it can be called through this.xxx in other life cycles.

If you use sfc syntax sugar + normal script option Api SFC syntax sugar exposes the xxx variable through defineExpose, and cannot be called through this.xxx or xxx in the option api. Here sfc syntactic sugar and setup function have a functional deviation, am I not finding the right way?

I found out that printing this in option-style api will throw exception Cannot convert object to primitive value, with or without sfc.

1. script + setup function
2. script + sfc syntax sugar
3. Optionally print this

您好，关于vue3+sfc
使用选项式api，包含setup函数，如果setup通过return返回了{xxx:'小明'}值，可以在其他生命周期中通过this.xxx进行调同。

如果使用sfc语法糖 + 普通的script选项式Api
SFC语法糖通过defineExpose暴露xxx变量，无法在选项式api中通过this.xxx或xxx的方式调用。这里sfc语法糖和setup函数产生了功能上的偏差，是我没有找到正确的方式吗？

我发现在选项式api中打印this将抛出异常Cannot convert object to primitive value，无论是否包含sfc。

[xhc-code]

@yyx990803 尤大佬， 麻烦解答下呗。

[Killea]

defineExport 是什么东西？你难道说的是defineexpose？

[xhc-code]

对，我修正一下

[chenxch]

expose details
文档中有对这个API的描述，你可以看一下，如果需要和v2一样你可以选择使用optionsAPI或者将所有属性方法都exposes(或则是暴露instance)

[xhc-code]

我想表达的是组合使用，变量的范围引用问题。

[xhc-code]

expose details 文档中有对这个API的描述，你可以看一下，如果需要和v2一样你可以选择使用optionsAPI或者将所有属性方法都exposes(或则是暴露instance)

选项式setup函数支持返回将返回的参数作为this上下文的数据项，可通过this.xxx进行引用。
sfc对setup函数的语法糖是不支持，还是需要其他方式？