运算符优先级- JavaScript | MDN
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运算符的优先级决定了表达式中运算执行的先后顺序，优先级高的运算符最先被执行。
The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.关联性决定了拥有相
