A brief discussion on pointers and addresses in JavaScript_javascript skills

Personal understanding: A pointer is just an index pointing to memory; and an address is the exact location in memory.

The following is a small example of pointers and addresses in functions:

function sum(num1,num2){
return num1+num2;
}
alert(sum(10,10));　　//20
var anotherSum=sum;
alert(anotherSum(10,10));　　//20
sum=null;
alert(anotherSum(10,10));　　//20

Note: Using a function name without parentheses is to access the function pointer, not to call the function, so sum and anotherSum point to the same function, that is, sum=null; does not affect anotherSum;

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