根据浏览器窗口大小自动缩放图片

(function($){   $.fn.resizeimage = function(){    var imgLoad = function (url, callback) {     var img = new Image();     img.src = url;     if (img.complete) {      callback(img.width, img.height);     } else {      img.onload = function () {       callback(img.width, img.height);       img.onload = null;      };     };    };    var original = {     width:$(window).width()    };    return this.each(function(i,dom){     var image = $(this);     imgLoad(image.attr('src'),function(){      var img = {       width:image.width(),       height:image.height()      },percentage=1;      if(img.width<original.width){       percentage = 1;      }else{       percentage = (original.width)/img.width;      }      image.width(img.w=img.width*percentage-30).height(img.h=img.height*percentage);      $(window).resize(function(){       var w = $(this).width();       percentage = w/img.width>1?1:w/img.width;       var newWidth = img.width*percentage-30;       var newHeight = img.height*percentage;       image.width(newWidth).height(newHeight);      });     });    });   };  })(jQuery);