JavaScript 的底层运行机制常被忽视，但执行上下文、作用域链、闭包与 this 的交互逻辑，直接决定了代码能否按预期运行。执行上下文是引擎在函数调用时创建的运行时记录，通过调用栈管理函数间的顺序；作用域链则基于静态作用域，在代码定义时确定变量查找路径。闭包本质上是被保留的外部 ...

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Sachin yadav @samtagon38824 47m First indentation is a issue, And it will print 500 buz the let has block scope 1 47 Ahamed ...

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