state.stack[-1][1]，self.stack = [] # the stack used for function calling, starting with [deffun,0].

这段代码应该是指一个解释器或编译器中的栈（stack）的实现。

stack是一种后进先出（Last In First Out，简称LIFO）的数据结构，它在函数调用时经常被使用。在这个例子中，代码中的self.stack代表一个栈对象，它被用于函数调用。

state.stack[-1][1]表示栈的最后一个元素的第二个值。这意味着在栈的最后一个元素中，它的第二个值是被调用函数的参数数量。例如，当调用一个函数时，第一个元素将是“deffun”，第二个元素将是参数数量。

而self.stack = [] 则是将栈清空，以便开始新的函数调用。

相关问题

lodash.clonedeep Maximum call stack size exceeded

The error message "Maximum call stack size exceeded" typically occurs when there is an infinite recursion or a very deep recursive function call. It means that the function is calling itself too many times, exhausting the call stack and causing the error.

In the case of `lodash.clonedeep`, it is a recursive function that deep clones an object. This error can occur if you have a circular reference in your object, meaning an object that references itself at some point.

To fix this issue, you can try to identify and resolve any circular references in your object. Alternatively, you can use a different approach to cloning objects, such as using `JSON.parse(JSON.stringify(obj))` or other libraries like `immer` or `rfdc` that handle cloning without the risk of exceeding the call stack size.

Unstable_TrapFocus.js:84 Uncaught RangeError: Maximum call stack size exceeded.

This error occurs when a function calls itself repeatedly until the call stack reaches its maximum limit. The most common cause of this error is a recursive function that doesn't have a proper exit condition, causing it to call itself indefinitely.

In the case of the Unstable_TrapFocus.js script, the error is likely caused by a recursive function that's being called repeatedly, causing the call stack to overflow. To fix the issue, you'll need to identify the recursive function and add an exit condition that prevents it from calling itself indefinitely.

One way to do this is to use a debugger to step through the code and identify the function that's causing the error. Once you've identified the function, you can add a conditional statement that checks if the exit condition has been met before calling the function again.

For example, if the function is supposed to iterate over an array and perform some action on each item, you can add a check that stops the iteration once the end of the array is reached:

function myRecursiveFunction(array, index) {
  if (index >= array.length) {
    return; // exit condition
  }
  
  // perform action on array[index]
  
  myRecursiveFunction(array, index + 1); // call function again with incremented index
}

By adding an exit condition to your recursive function, you can prevent it from calling itself indefinitely and avoid the "Maximum call stack size exceeded" error.