JS大小转化B KB MB GB的转化方法

    function conver(limit){
            var size = "";
            if( limit < 0.1 *  ){ //如果小于0.1KB转化成B
                size = limit.toFixed() + "B";
            }else if(limit < 0.1 *  *  ){//如果小于0.1MB转化成KB
                size = (limit / ).toFixed() + "KB";
            }else if(limit < 0.1 *  *  * ){ //如果小于0.1GB转化成MB
                size = (limit / ( * )).toFixed() + "MB";
            }else{ //其他转化成GB
                size = (limit / ( *  * )).toFixed() + "GB";
            }  

            var sizestr = size + "";
            var len = sizestr.indexOf("\.");
            var dec = sizestr.substr(len + , );
            if(dec == ""){//当小数点后为00时 去掉小数部分
                return sizestr.substring(,len) + sizestr.substr(len + ,);
            }
            return sizestr;
        }