text: $.fn.popImg = function() {
  
    var $layer = $("<div/>").css({
      position: "fixed",
      left: 0,
      right: 0,
      top: 0,
      bottom: 0,
      height: "100%",
      width: "100%",
      zIndex: 9999999,
      background: "#000",
      opacity: "0.6",
      display: "none"
    }).attr("data-id", "b_layer");
  
    var cloneImg = function($node) {
      var left = $node.offset().left;
      var top = $node.offset().top;
      var nodeW = $node.width();
      var nodeH = $node.height();
      return $node.clone().css({
        position: "fixed",
        width: nodeW,
        height: nodeH,
        left: left,
        top: top,
        zIndex: 10000000
      });
    };
  
    var justifyImg = function($c) {
      var dW = $(window).width();
      var dH = $(window).height();
      $c.css("cursor", "zoom-out").attr("data-b-img", 1);
      var img = new Image();
      img.onload = function(){
        $c.stop().animate({
          // width: this.width,
          // height: this.height,
          // left: (dW - this.width) / 2,
          // top: (dH - this.height) / 2
          width: '500px',
          height: '500px',
          left: '35%',
          top: '27%',
        }, 300);
      };
      img.src = $c.attr("src");
      $(img).css('border','2px')
    };
  
    this.each(function(){
      $(this).css("cursor", "zoom-in").on("click", function(){
        var $b = $("body");
        $layer.appendTo($b);
        $layer.fadeIn(300);
        var $c = cloneImg($(this));
        $c.appendTo($b);
        justifyImg($c);
      });
    });
  
    var timer = null;
    $(window).on("resize", function(){
      $("img[data-b-img]").each(function(){
        var $this = $(this);
        timer && clearTimeout(timer);
        timer = setTimeout(function(){
          justifyImg($this);
        }, 10);
      });
    });
  
    $(window).on("click keydown", function(evt){
      if(evt.type == "keydown" && evt.keyCode === 27) {
        $layer.fadeOut(300);
        $("img[data-b-img]").remove();
      }
      var $this = $(evt.target);
      if($this.attr("data-id") == "b_layer" || $this.attr("data-b-img") == 1) {
        $layer.fadeOut(300);
        $("img[data-b-img]").remove();
      }
    });
  
  };
  