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https://yq.aliyun.com/articles/253170?spm=5176.100240.searchblog.9.8tMWIb 参考这篇文章// Convert a base-64 string to a byte array base64ToBytes (base64) { // Use browser-native function if it exists if (typeof atob === 'function') return this.stringToBytes(window.atob(base64)) // Remove non-base-64 characters base64 = base64.replace(/[^A-Z0-9+/]/ig, '') var bytes = [] for (var i = 0; i >> 4)) break case 2: bytes.push(((base64map.indexOf(base64.charAt(i - 1)) & 0xF) >> 2)) break case 3: bytes.push(((base64map.indexOf(base64.charAt(i - 1)) & 0x3) 一定要转成base64ToBytes