JavaScript while 控制台 返回值

控制台输出的是while循环体里最后一条表达式的运算结果！

var n = 10;
var i = 0;
while(i < n){
    i ++;
}//9

var n = 10;
var i = 0;
while(i < n){
    i ++;
    n;
}//10

var n = 10;
var i = 0;
while(i < n){
    i ++;
    n;
    n + 3;
}//13

var n = 10;
var i = 0;
while(i < n){
    i ++;
    n;
    3 + 3;
}//6