JavaScript Advanced Programming-(2) Basic concepts

for-in statements

The for-in statement is an iterative statement used to enumerate object properties, Syntax:
For (property in expression) statement
Instance:
for (var propname in window) {
document.write (propname);
}

Understanding Parameters

The ECMAScript function parameter does not mind passing in how many parameters, the defined function receives 2 parameters, but the call does not necessarily pass 2 parameters, can be more than a few
In the body of the function, this array of parameters is accessed through the arguments object, as described below:

No overloads

The ECMAScript function cannot implement overloading, and if 2 functions are defined, the following functions will be executed, as described below

JavaScript Advanced Programming-(2) Basic concepts