如果我一個頁面、有兩個地方上傳圖片但是我想他們的key不同，要怎么才能分開不沖突呢，我現(xiàn)在的做法是創(chuàng)建兩個文件var uploader1= Qiniu.uploader({'Key': function(up, file) {            var now = new Date();            var date = now.getFullYear()+((now.getMonth()+1)<10?"0":"")+(now.getMonth()+1)+(now.getDate()<10?"0":"")+now.getDate();            return "topic/cover/"+date;        },})var uploader2= Qiniu.uploader({    'Key': function(up, file) {            var now = new Date();            var date = now.getFullYear()+((now.getMonth()+1)<10?"0":"")+(now.getMonth()+1)+(now.getDate()<10?"0":"")+now.getDate();            return "topic/banner/"+date;        },    })})但是這樣做為什么key會相同呢