不使用中间变量，交换int型的 a, b两个变量的值

(function(){
var a = 10, b = 2;
a = a + b;
b = a - b;
a = a - b;
alert(a+" "+b);
})();

(function(){
var a = 10,b=2;
a = a^b;
b = b^a;
a = a ^b;
alert(a+" "+b);
})();

(function(){
var a =10,b =2 ;
a=[a,b];
b=a[0];
a=a[1];
alert(a+" "+b)
})();
//简化一下：
(function(){
var a =10,b =2 ;
a=[b,b=a][0];
alert(a+" "+b)
})();

(function(){
var a = 10,b = 2;
a = {a : b, b : a};
b = a.b;
a = a.a;
alert(a+" "+b);
})();

(function(){
var a = 10,b = 2;
a=(function(){
try {
return b;
}
finally {
b = a;
}
})();
alert(a+" "+b);
})();

(function(){
var a = 10,b = 2;
eval("a="+b+";b="+a);
alert(a+" "+b);
})();

(function(){
var a =10,b =2 ;
a = b+(b = a)*0;
alert(a+" "+b)
})();

(function(){
var a =10,b =2 ;
a = (a + b) - (b = a);
alert(a+" "+b)
})();