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)})();?