One common cause of side effects is evaluating a function call in a debugger window.
产生副作用的一个常见原因，是在调试器窗口中计算函数调用。
The debugger cannot tell whether a property evaluation or implicit function call has side effects.
调试器无法区分是属性计算还是隐式函数调用产生副作用。
The debugger cannot tell whether a property evaluation or implicit function call has side effects.
调试器无法区分是属性计算还是隐式函数调用产生副作用。
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