/*  * 移動端模擬導航可點擊自動滑動 0.1.4  * Date: 2017-01-11  * by: xiewei  * 導航可左右滑動，可點擊邊緣的一個，自動滾動下一個到可視范圍【依賴于iscroll.js】  */ (function ($) {  $.fn.navbarscroll = function (options) {   //各種屬性、參數   var _defaults = {    className:'cur', //當前選中點擊元素的class類名    clickScrollTime:300, //點擊后滑動時間    duibiScreenWidth:0.4, //單位以rem為準，默認為0.4rem    scrollerWidth:3, //單位以px為準，默認為3,[僅用于特殊情況：外層寬度因為小數點造成的不精準情況]    defaultSelect:0, //初始選中第n個，默認第0個    fingerClick:0, //目標第0或1個選項觸發,必須每一項長度一致，方可用此項    endClickScroll:function(thisObj){}//回調函數   }   var _opt = $.extend(_defaults, options);   this.each(function () {    //插件實現代碼    var _wrapper = $(this);    var _win = $(window);    var _win_width = _win.width(),_wrapper_width = _wrapper.width(),_wrapper_off_left = _wrapper.offset().left;    var _wrapper_off_right=_win_width-_wrapper_off_left-_wrapper_width;    var _obj_scroller = _wrapper.children('.scroller');    var _obj_ul = _obj_scroller.children('ul');    var _obj_li = _obj_ul.children('li');    var _scroller_w = 0;    _obj_li.css({"margin-left":"0","margin-right":"0"});    for (var i = 0; i < _obj_li.length; i++) {     _scroller_w += _obj_li[i].offsetWidth;    }    _obj_scroller.width(_scroller_w+_opt.scrollerWidth);    var myScroll = new IScroll('#'+_wrapper.attr('id'), {     eventPassthrough: true,     scrollX: true,     scrollY: false,     preventDefault: false    });    _init(_obj_li.eq(_opt.defaultSelect));    _obj_li.click(function(){     _init($(this));    });    //解決PC端谷歌瀏覽器模擬的手機屏幕出現莫名的卡頓現象，滑動時禁止默認事件（2017-01-11）    _wrapper[0].addEventListener('touchmove',function (e){e.preventDefault();},false);    function _init(thiObj){     var $this_obj=thiObj;     var duibi=_opt.duibiScreenWidth*_win_width/10,this_index=$this_obj.index(),this_off_left=$this_obj.offset().left,this_pos_left=$this_obj.position().left,this_width=$this_obj.width(),this_prev_width=$this_obj.prev('li').width(),this_next_width=$this_obj.next('li').width();     var this_off_right=_win_width-this_off_left-this_width;     if(_scroller_w+2>_wrapper_width){      if(_opt.fingerClick==1){       if(this_index==1){        myScroll.scrollTo(-this_pos_left+this_prev_width,0, _opt.clickScrollTime);       }else if(this_index==0){        myScroll.scrollTo(-this_pos_left,0, _opt.clickScrollTime);       }else if(this_index==_obj_li.length-2){        myScroll.scrollBy(this_off_right-_wrapper_off_right-this_width,0, _opt.clickScrollTime);       }else if(this_index==_obj_li.length-1){        myScroll.scrollBy(this_off_right-_wrapper_off_right,0, _opt.clickScrollTime);       }else{        if(this_off_left-_wrapper_off_left-(this_width*_opt.fingerClick)<duibi){         myScroll.scrollTo(-this_pos_left+this_prev_width+(this_width*_opt.fingerClick),0, _opt.clickScrollTime);        }else if(this_off_right-_wrapper_off_right-(this_width*_opt.fingerClick)<duibi){         myScroll.scrollBy(this_off_right-this_next_width-_wrapper_off_right-(this_width*_opt.fingerClick),0, _opt.clickScrollTime);        }       }      }else{       if(this_index==1){        myScroll.scrollTo(-this_pos_left+this_prev_width,0, _opt.clickScrollTime);       }else if(this_index==_obj_li.length-1){        if(this_off_right-_wrapper_off_right>1||this_off_right-_wrapper_off_right<-1){         myScroll.scrollBy(this_off_right-_wrapper_off_right,0, _opt.clickScrollTime);        }       }else{        if(this_off_left-_wrapper_off_left<duibi){         myScroll.scrollTo(-this_pos_left+this_prev_width,0, _opt.clickScrollTime);        }else if(this_off_right-_wrapper_off_right<duibi){         myScroll.scrollBy(this_off_right-this_next_width-_wrapper_off_right,0, _opt.clickScrollTime);        }       }      }     }     $this_obj.addClass(_opt.className).siblings('li').removeClass(_opt.className);     _opt.endClickScroll.call(this,$this_obj);    }   });  }; })(jQuery);