数据驱动、坚持为客户提供有价值的服务和内容
function Base64() {
// private property
let _keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
// public method for encoding
this.encode = function (input) {
var o
