GPT答：

7i24.cn

```javascript
// debug testing scenario
// Assume a function test_func exists

// call the function
test_func();

// add a breakpoint to which debug control will jump
debugger;

// change value of a parameter
let param_1 = 1;

// run the function again
test_func(param_1);

// print out the output
console.log(test_func);
```