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General idea:

1. Listen to onpaste event

2. Get the clipboard data event.clipboardData through the event parameter in the event callback (not supported by all browsers)

   // '/image/.test(event.clipboardData.types)' // 檢查是否為圖片
   
   // 獲取圖片二進(jìn)制數(shù)據(jù)（似乎瀏覽器的實(shí)現(xiàn)都會(huì)有大小差異）
   Array.each(event.clipboardData.items, function(item){
   if (/image/.test(item.type)) {
   var blob = item.getAsFile();
   var URL = window.URL || window.webkitURL;
   var source = URL.createObjectURL(blob);
   console.log(source) 
   }
   });

3. Send data to the backend server through Ajax. After the backend stores the image, it returns an accessible address of the image

4. Visit this address to see the pictures