js利用闭包锁变量

function doSome ( i ) {
	console.log( i );
}
var arr = [];
for ( var i = 0 ; i < 3 ; i++ ) {
	arr[ i ] = ( function ( i ) {
		return function () {
			doSome( i );
		};
	} )( i );
};
arr[ 0 ]();
arr[ 1 ]();
arr[ 2 ]();

result:

0

1

2

perfect!