$(document).ready(function(){
  var $iBox = $(\'.imgBox\'),
    $iNum = $(\'.imgNum\'), //缓存优化
    indexImg = 1,     //初始下标
    totalImg = 4,     //图片总数量
    imgSize = 300,     //图片尺寸 宽度
    moveTime = 1100,    //切换动画时间
    setTime = 2500,    //中间暂停时间
    clc = null;
 
  function moveImg(){
    if(indexImg != totalImg){
      $iBox.animate({
        left: -(indexImg*imgSize) + \'px\'
      }, moveTime);
      $iNum.removeClass(\'mark-color\')
        .eq(indexImg)
        .addClass(\'mark-color\');
      indexImg++;
    }
    else{
      indexImg = 1;
      $iNum.removeClass(\'mark-color\')
        .eq(indexImg - 1)
        .addClass(\'mark-color\');
      $iBox.animate({
        left: 0
      }, moveTime);
    }
  }
  $iNum.hover(function(){
    $iBox.stop();          //结束当前动画
    clearInterval(clc);       //暂停循环
    $iNum.removeClass(\'mark-color\');
    $(this).addClass(\'mark-color\');
    indexImg = $(this).index();
    $iBox.animate({
      left: -(indexImg*imgSize) + \'px\'
    }, 500);
  },function(){
    clc = setInterval(moveImg, setTime);
  });
 
  clc = setInterval(moveImg, setTime);
});