if-else.js

这是《JavaScript学习源代码》一书的源代码

var num = 2, bool = false;
// is the number 1 and the boolean value true ?
if(num == 1 && bool == 1)  alert("TEST1 bool: " + bool);
else
// is the number 2 and the boolean value true ?
if(num == 2 && bool == 1)  alert("TEST2 bool: " + bool);
else
// is the number 2 and the boolean value false ?
if(num == 2 && bool == 0)  alert("TEST3 bool: " + bool);
else
// is the number 3 and the boolean value false ?
if(num == 3 && bool == 0)  alert("TEST4 bool: " + bool);