python-31:然而我發現結果並非我想要的

程序運行完成以後，當我興沖沖的打開文件夾時，卻發現雖然程序已經按個人預期正常運行，圖片也已經下載好了，可是下載到的圖片倒是小圖片，這並非我想要的，確定是什麼地方出錯了

這並非我想要的結果，可是不能說前面的代碼徹底是錯誤的，前面的代碼演示了圖片下載中一種比較簡單的狀況。

你們可能會發現一個問題，瀏覽網頁上的圖片的時，會有如下幾種狀況

1. 圖片都在一個頁面上顯示，就像這個網址展現的同樣：

   https://mm.taobao.com/687471686.htm?spm=719.7800760.a312r.19.W8893x

       代碼有點長，往右拉會看到全部img圖片的信息

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ine-height: 1.5;">&nbsp;</span></div><div style="text-align: center;padding-bottom: 0.0px;margin: 0.0px;padding-left: 0.0px;padding-right: 0.0px;padding-top: 0.0px;"><strong style="line-height: 1.5;color: #0000ff;font-size: 24.0px;"><img width="630" height="945" style="margin: 10.0px;width: 630.0px;float: none;height: 945.0px;" src="//img.alicdn.com/imgextra/i2/687471686/TB1wGjBGVXXXXa5aXXXXXXXXXXX_!!687471686-0-tstar.jpg"/></strong></div><div style="text-align: center;padding-bottom: 0.0px;margin: 0.0px;padding-left: 0.0px;padding-right: 0.0px;padding-top: 0.0px;"><strong style="line-height: 1.5;color: #0000ff;font-size: 24.0px;"></strong><img style="float: none;margin: 10.0px;" src="//img.alicdn.com/imgextra/i4/687471686/TB1GDOAFFXXXXc7bpXXXXXXXXXX_!!687471686-0-tstar.jpg_620x10000.jpg"/></div><div style="text-align: center;padding-bottom: 0.0px;margin: 0.0px;padding-left: 0.0px;padding-right: 0.0px;padding-top: 0.0px;">&nbsp;<img class="hoverZoomLink" style="line-height: 1.5;float: none;margin: 10.0px;" src="//img.alicdn.com/imgextra/i1/687471686/TB1DCDxIXXXXXbuXFXXXXXXXXXX_!!687471686-0-tstar.jpg_620x10000.jpg"/></div><div style="text-align: center;padding-bottom: 0.0px;margin: 0.0px;padding-left: 0.0px;padding-right: 0.0px;padding-top: 0.0px;">&nbsp;</div><div style="text-align: center;padding-bottom: 0.0px;margin: 0.0px;padding-left: 0.0px;padding-right: 0.0px;padding-top: 0.0px;">&nbsp;</div><div style="text-align: center;padding-bottom: 0.0px;margin: 0.0px;padding-left: 0.0px;padding-right: 0.0px;padding-top: 0.0px;"><img style="float: none;margin: 10.0px;" class="hoverZoomLink" src="//img.alicdn.com/imgextra/i1/687471686/TB1ET6UIXXXXXbHXXXXXXXXXXXX_!!687471686-0-tstar.jpg_620x10000.jpg"/></div><div style="text-align: center;padding-bottom: 0.0px;margin: 0.0px;padding-left: 0.0px;padding-right: 0.0px;padding-top: 0.0px;"><span style="color: #0000ff;"><span style="font-size: 24.0px;"><strong><span style="color: #ff0000;"><img style="float: none;margin: 10.0px;" class="hoverZoomLink" src="//img.alicdn.com/imgextra/i4/687471686/TB1YRWaHFXXXXXaXFXXXXXXXXXX_!!687471686-0-tstar.jpg_620x10000.jpg"/>&nbsp;</span></strong></span></span></div><div style="text-align: center;padding-bottom: 0.0px;margin: 0.0px;padding-left: 0.0px;padding-right: 0.0px;padding-top: 0.0px;"><img style="float: none;margin: 10.0px;" class="hoverZoomLink" src="//img.alicdn.com/imgextra/i1/687471686/TB1eiChHFXXXXbQXFXXXXXXXXXX_!!687471686-0-tstar.jpg_620x10000.jpg"/></div><div style="text-align: center;padding-bottom: 0.0px;margin: 0.0px;padding-left: 0.0px;padding-right: 0.0px;padding-top: 0.0px;"><img style="float: none;margin: 10.0px;" class="hoverZoomLink" src="//img.alicdn.com/imgextra/i3/687471686/TB1QxyaHFXXXXb5XVXXXXXXXXXX_!!687471686-0-tstar.jpg_620x10000.jpg"/></div><div style="text-align: center;padding-bottom: 0.0px;margin: 0.0px;padding-left: 0.0px;padding-right: 0.0px;padding-top: 0.0px;">&nbsp;</div><div style="text-align: center;padding-bottom: 0.0px;margin: 0.0px;padding-left: 0.0px;padding-right: 0.0px;padding-top: 0.0px;">&nbsp;</div><div style="text-align: center;padding-bottom: 0.0px;margin: 0.0px;padding-left: 0.0px;padding-right: 0.0px;padding-top: 0.0px;">&nbsp;</div><div style="text-align: center;padding-bottom: 0.0px;margin: 0.0px;padding-left: 0.0px;padding-right: 0.0px;padding-top: 0.0px;"><span style="color: #0000ff;"><span style="font-size: 24.0px;"><strong><span style="color: #ff0000;"><img style="float: none;margin: 10.0px;" class="hoverZoomLink" src="//img.alicdn.com/imgextra/i1/687471686/TB1ZO3PHpXXXXaVaXXXXXXXXXXX_!!687471686-0-tstar.jpg_620x10000.jpg"/> </span></strong></span></span></div><div style="text-align: center;padding-bottom: 0.0px;margin: 0.0px;padding-left: 0.0px;padding-right: 0.0px;padding-top: 0.0px;">&nbsp;</div><div style="text-align: center;padding-bottom: 0.0px;margin: 0.0px;padding-left: 0.0px;padding-right: 0.0px;padding-top: 0.0px;"><span style="color: #0000ff;"><span style="font-size: 24.0px;"><strong><span style="color: #ff0000;"><img style="float: none;margin: 10.0px;" class="hoverZoomLink" src="//img.alicdn.com/imgextra/i1/687471686/TB1I6Y_HpXXXXXUXVXXXXXXXXXX_!!687471686-0-tstar.jpg_620x10000.jpg"/> </span></strong></span></span></div><div style="text-align: center;padding-bottom: 0.0px;margin: 0.0px;padding-left: 0.0px;padding-right: 0.0px;padding-top: 0.0px;"><span style="color: #0000ff;"><span style="font-size: 24.0px;"><strong><span style="color: #ff0000;"><img style="float: none;margin: 10.0px;" class="hoverZoomLink" src="//img.alicdn.com/imgextra/i1/687471686/TB1X9b9HpXXXXbaXVXXXXXXXXXX_!!687471686-0-tstar.jpg_620x10000.jpg"/> </span></strong></span></span></div><div style="text-align: center;padding-bottom: 0.0px;margin: 0.0px;padding-left: 0.0px;padding-right: 0.0px;padding-top: 0.0px;"><span style="color: #0000ff;"><span style="font-size: 24.0px;"><strong><span style="color: #ff0000;"><img style="float: none;margin: 10.0px;" class="hoverZoomLink" src="//img.alicdn.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nbsp;</span></strong></p><p style="text-align: center;">&nbsp;<span style="color: #ff0000;"><span style="font-size: 24.0px;"><strong>時尚衛衣</strong></span></span></p><p style="text-align: center;">&nbsp;</p><p style="text-align: center;"><img style="margin: 10.0px;float: none;" class="hoverZoomLink" src="//img.alicdn.com/imgextra/i4/687471686/TB1bz4mFFXXXXciapXXXXXXXXXX_!!687471686-0-tstar.jpg_620x10000.jpg"/></p><p style="text-align: center;"><span style="font-size: 24.0px;"><span style="color: #ff0000;"><strong>西裝外套</strong></span></span><span style="line-height: 1.5;">&nbsp;</span></p><p style="text-align: center;"><img style="margin: 10.0px;float: none;" src="//img.alicdn.com/imgextra/i2/687471686/TB1NIYVFFXXXXc_aXXXXXXXXXXX_!!687471686-0-tstar.jpg"/></p><p style="text-align: center;"><img style="margin: 10.0px;float: none;" class="hoverZoomLink" src="//img.alicdn.com/imgextra/i1/687471686/TB1KLtlFFXXXXXFbXXXXXXXXXXX_!!687471686-0-tstar.jpg_620x10000.jpg"/><span style="line-height: 1.5;">&nbsp;</span></p><div style="text-align: center;padding-bottom: 0.0px;margin: 0.0px;padding-left: 0.0px;padding-right: 0.0px;padding-top: 0.0px;"><span style="font-size: 18.0px;"><span><span style="line-height: 27.0px;"></span></span></span><div style="text-align: center;padding-bottom: 0.0px;margin: 0.0px;padding-left: 0.0px;padding-right: 0.0px;padding-top: 0.0px;"><div style="text-align: center;padding-bottom: 0.0px;margin: 0.0px;padding-left: 0.0px;padding-right: 0.0px;font-size: large;padding-top: 0.0px;"><p style="text-align: center;">&nbsp;<span style="font-size: 18.0px;"><span style="font-family: microsoft yahei;"><span style="color: #000000;"><span><strong style="font-style: normal;font-weight: bold;">◆◇◆◇◆◇◆◇◆◇◆◇◆◇◆◇◆◇◆◇◆◇◆◇◆◇◆◆◇◆◇◆◇◆◇◆◇◆◇◆◇◆◇◆◇◆◇◆◇</strong></span></span></span></span></p></div></div></div><div style="text-align: center;"><div style="text-align: center;"><div style="text-align: center;"><span style="line-height: 36.0px;font-size: 24.0px;"><strong><font style="background-color: #ffffff;"><span style="font-family: 宋體;color: black;"><span style="font-family: 宋體;color: black;"><font style="background-color: #ffffff;" color="#3d85c6" face="黑體"><span style="font-family: 宋體;color: black;"><font color="#3d85c6"></font></span></font></span></span></font></strong></span></div><div style="text-align: right;"><div style="text-align: center;"><strong style="font-size: 24.0px;"><span style="color: #0000ff;">我和湖南衛視主持人樂樂姐</span></strong></div></div><p style="text-align: center;"><span style="font-size: 18.0px;"><strong><span style="color: #0000ff;"><img style="margin: 0.0px;float: none;" src="//img.alicdn.com/sns_album/i2/T1bh87XitIXXb1upjX.jpg"/> </span></strong></span></p><p style="text-align: center;"><span style="font-size: 24.0px;"><strong><span style="color: #0000ff;">我和明星溫碧霞</span></strong></span></p><p style="text-align: center;"><strong><span style="color: #0000ff;"><span style="font-size: 24.0px;"><img style="margin: 0.0px;float: none;" src="//img.alicdn.com/sns_album/i1/T1fMyiXlJcXXb1upjX.jpg"/> </span></span></strong></p><p style="text-align: center;"><span style="font-size: 24.0px;"><strong><span style="color: #0000ff;">我和明星周海媚</span></strong></span></p><p style="text-align: center;"><img style="margin: 0.0px;float: none;" src="//img.alicdn.com/sns_album/i4/T16fmiXdFiXXb1upjX.jpg"/></p><p style="text-align: center;"><span style="font-size: 24.0px;"><span style="color: #ff0000;"><strong>我和韓寒</strong></span></span></p><p style="text-align: center;"><img style="border-right-width: 0.0px;margin: 0.0px;float: none;border-top-width: 0.0px;border-bottom-width: 0.0px;border-left-width: 0.0px;" src="//img.alicdn.com/sns_album/i4/T1buSiXgFmXXb1upjX.jpg"/></p></div></div><p>&nbsp;</p>
</div>
<!--愛秀內容結束->

       這種狀況能夠直接使用咱們前面所編寫的代碼直接一次性將圖片下載，而且下載的是你看到的圖片

    2. 被封裝在CSS樣式或者調用JS顯示的圖片，這種有不少表現形式，好比像百度圖片同樣，每一版固定加載必定數量的圖片，而後你往下拉它又會不斷加載，還有就是像咱們極視界相冊網頁上的同樣，上面顯示一個大圖，下面顯示一些小圖片

咱們再來看看這個相冊的網頁源碼

<!--strat-->
<div class="effect">
      <div class="effect_top">
         <div class="effect_img" id="effect_img">
            <a class="effect_img_left" href="http://product.yesky.com/gshijie/sheying/35/51594035_14.shtml" target="_self"></a>
         <span><img src="http://image.tianjimedia.com/uploadImages/2015/065/00/53R466408947_1000x500.jpg" alt="移軸鏡頭紀錄夢幻風光大片" /></span>
            <a class="effect_img_right" href="http://product.yesky.com/gshijie/sheying/35/51594035_2.shtml" target="_self"></a>
         </div>
      </div>
      
      <div class="clear"></div>
      <div class="effect_bottom">
                                                                     <div class="effect_syz">
<div><span><a href="http://product.yesky.com/gshijie/sheying/27/51594027.shtml"><img src="http://image.tianjimedia.com/uploadImages/2015/065/33/1ODMD78HA21V_100x75.jpg" alt="極簡風光攝影 極簡的美" /></a></span></div>
<p><a href="http://product.yesky.com/gshijie/sheying/27/51594027.shtml">&lt;&lt;上一組</a></p>
</div>
                                     <div class="effect_scroll" id="scroll">
            <div class="viewport">
               <div class="overview" style="left: 0px; ">
<ul>
 <li  class="bottom_show"  >
<a href="http://product.yesky.com/gshijie/sheying/35/51594035.shtml"><img src="http://image.tianjimedia.com/uploadImages/2015/065/00/53R466408947_80x60.jpg" alt="移軸鏡頭紀錄夢幻風光大片_風光"/></a>
</li>
 <li >
<a href="http://product.yesky.com/gshijie/sheying/35/51594035_2.shtml"><img src="http://image.tianjimedia.com/uploadImages/2015/065/04/2G35M4E8Z02G_80x60.jpg" alt="移軸鏡頭紀錄夢幻風光大片_風光"/></a>
</li>
 <li >
 ......

通過分析咱們知道，咱們前面是把<li  class="bottom_show"  >代碼塊裏面的圖片獲取出來了，因此說下載的就是這些80*60 的小圖片，那麼爲了將大圖片下載下來，咱們須要再一次對源碼進行分析