setTimeout传参数有关问题

setTimeout传参数问题

JScript code

  for (var i = 0; i < 3; i++){      setTimeout(function(){alert(i);}, (i+1)*5000);}

JScript code

for (var i = 0; i < 3; i++) {    setTimeout((function (k) {        return function () {            alert(k);        }    })(i), (i + 1) * 1000);}