JS技巧之一行赋值语句能玩出多少花样

var a=1;
a=2;
console.log(a);

var a=1;
(function(){
a=2;
})();
console.log(a);

var a=1;
eval(a=2);
console.log(a);

var a=1;
var b=["a","=",2];
eval(b[0]+b[1]+b[2]);
console.log(a);

var a=1;
[].constructor.constructor(a=2);
console.log(a);

var a=1;
[].constructor.constructor(a=2)();
console.log(a);

var a=1;
var b=["a","=",2];
[].constructor.constructor(b[0]+b[1]+b[2])();
console.log(a);

var a=1;
var b=["a","=",2,"constructor"];
[][b[3]][b[3]](b[0]+b[1]+b[2])();
console.log(a);

var a=0x2c0f8^0x2c0f9;
var b=['a','=',0xe3b2c^0xe3b2e,'constructor'];
[][b[0xa8ddf^0xa8ddc]][b[0xb3a35^0xb3a36]](b[0x3333f^0x3333f]+b[0x84d18^0x84d19]+b[0x50958^0x5095a])();
console['log'](a);