2. The arguments attribute inside the function is a class array object. It is mainly used to save function parameters. However, this object has a property named callee, which is a pointer, point to the function that owns this arguments object

Example: (1) function factorial (Num ){
If (Num <= 1 ){
Return 1;
} Else {
Return num * factorial (num-1 );
}
} // Recursive Algorithm
VaR truefactorial = factorial; // copy factorial to truefactorial
Factorial = function (){
Return 0;
} // Override the factorial function
Alert (truefactorial (5); // 0; because the resignation factorial function has changed, it was originally called in factorial and has changed
Alert (factorial (5); // 0
;
(2), function factorial (Num ){
If (Num <= 1 ){
Return 1;
} Else {
Return num * arguments. callee (num-1); // point to own arguments function itself, not affected by function name changes
}
}
VaR truefactorial = factorial;
Factorial = function (){
Return 0;
}
Alert (truefactorial (5); // 120;
Alert (factorial (5); // 0