回答編集履歴

ついき

2019/12/03 03:32

投稿

スコア116661

test CHANGED Viewed

@@ -161,3 +161,71 @@
 ```
+# 最後の次は最初、最初の前は最後
+```javascript
+$(function(){
+  var left=0;
+  var current=0;
+  $('.next').on('click',function(){
+    var w=$('.slider-list img').eq(current).width();
+    var len=$('.slider-list img').length;
+    current++;
+    if(current<len){
+      left-=w;
+    }else{
+      left =0;
+      current=0;
+    }
+    $('.slider-list').animate({left:left});
+  });
+  $('.prev').on('click',function(){
+    var w=$('.slider-list img').eq(current).width();
+    var len=$('.slider-list img').length;
+    current--;
+    if(current>=0){
+      left+=w;
+    }else{
+      left=-$('.slider-list img:not(:last)').map(function(){
+        return $(this).width();
+      }).get().reduce((x,y)=>x+y);
+      current=len-1;
+    }
+    $('.slider-list').animate({left:left});
+  });
+});
+```