The relationship between the Blob,base64,url in JS

Base64 encoding and decoding of JS

  English is this: 
//  Atob () decodes base64  Span style= "color: #008000;" >//  Btoa () transcode the string to base64  var  str =   javascript    ;window.btoa (str)  //  transcoding results "amf2yxnjcmlwda=="  Window.atob ( " Span style= "color: #800000;" >amf2yxnjcmlwda==   )  //  decoding results "JavaScript" 
 
 
 
 Chinese needs a special look. transcoding  encodeuricomponent and decodeURIComponent 
 
 Console.log (Window.btoa (encodeuricomponent ("haha")) are required 

Console.log (decodeURIComponent (Window.atob ("JUU1JTKZJTG4JUU1JTKZJTG4")))

Juu1jtkzjtg4juu1jtkzjtg4
Ha ha

base64 to Blob object, file upload

/** * base64 to Blob object, file Upload * reprinted from: http://blog.csdn.net/hsany330/article/details/52575459 * @param datauri * @returns {Blob}*/  functionDatauritoblob (Datauri) {varbyteString = Atob (Datauri.split (', ') [1]); varmimestring = Datauri.split (', ') [0].split (': ') [1].split (';') [0]; varAB =NewArrayBuffer (bytestring.length); varIA =NewUint8array (AB);  for(vari = 0; i < bytestring.length; i++) {Ia[i]=bytestring.charcodeat (i); }      return NewBlob ([ab], {type:mimestring}); }

The relationship between the Blob,base64,url in JS