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flutter，想问下this的用法？

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flutter，想问下this的用法？

在同个DART文件中，定义的变量，我看有的教程，在使用变量时会加this.变量名
我实验了一下，去掉这个this也可以运行。
对这有点疑问。
新手问问老司机。


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