点击li跳转时总跳转至第一个li的页面。而alert显示的是正确的innertext

var obj_lis = document.getElementById("my_list_movie").getElementsByTagName("li");  
            for(i = 0; i < obj_lis.length; i++) {  
                obj_lis[i].onclick = function() {  
                    if(this.innerHTML.indexOf("电影票订单")) {  
                        window.location.href = "ticket_order.html";  
                        alert(this.innerHTML);  
                    } else if(this.innerHTML.indexOf("代金优惠卷")) {  
                        window.location.href = "coupons.html";  
                        alert(this.innerHTML);  
                    } else if(this.innerHTML.indexOf("收藏的电影")) {  
                        window.location.href = "favorite_movie.html";  
                        alert(this.innerHTML);  
                    }  
                }  
            }