兼容ie6+,chrome,firefox,opera,360等等浏览器,亲测。附加demo。参数说明://默认参数vardefaults={//插件的默认设置imgWidth:'100%',//img宽度imgHeight:'100%',//img高度imgType:["gif","jpeg","jpg","bmp","png"],//图片类型showDiv:'',//装载预览图片div的idfileObj:null,//inputfile对象