在javascript中使用btoa()方法实现https请求，具体方法如下：
function b64EncodeUnicode(str) {return btoa(encodeURIComponent(str).replace(/%([0-9A-F]{2})/g, function(match, p1) {return String.fromCharCode('0x' + p1);}));}
function b64EncodeUnicode(str) {
return btoa(encodeURIComponent(str).replace(/%([0-9A-F]{2})/g,
function(match, p1) {
return String.fromCharCode('0x' + p1);
}));
}
