[游戏开发]JavaScript关于pako.js压缩中文字符串

class zip{
	unzipStr(str) {
		let Utf8ArrayToStr = function(array) { // 数据流转化为字符串, 兼容汉字
			var out = "", i = 0, len = array.length, char1, char2, char3, char4;
			while(i < len) {
				char1 = array[i++];
				// 当单个字节时, 最大值 '01111111', 最小值 '00000000' 右移四位 07, 00
				// 当两个字节时, 最大值 '11011111', 最小值 '11000000' 右移四位 13, 12
				// 当三个字节时, 最大值 '11101111', 最小值 '11100000' 右移四位 14, 14
				if (char1 >> 4 <= 7) {
					out += String.fromCharCode(char1);
				} else if (char1 >> 4 == 12 || char1 >> 4 == 13) {
					char2 = array[i++];
					out += String.fromCharCode(((char1 & 0x1F) << 6) | (char2 & 0x3F));
				} else if (char1 >> 4 == 14) {
					char2 = array[i++];
					char3 = array[i++];
					char4 = ((char1 & 0x0F) << 12) | ((char2 & 0x3F) << 6);
					out += String.fromCharCode(char4 | ((char3 & 0x3F) << 0));
				}
			}
			return out;
		};
		function handleCodePoints(array) {
			var CHUNK_SIZE = 0x8000; // arbitrary number here, not too small, not too big
			var index = 0;
			var length = array.length;
			var result = '';
			var slice;
			var arr = [];
			for(var i = 0, _i = array.length; i < _i; i++) {
				arr[i] = array[i];
			}
			while(index < length) {
				slice = arr.slice(index, Math.min(index + CHUNK_SIZE, length)); // `Math.min` is not really necessary here I think
				result += String.fromCharCode.apply(null, slice);
				index += CHUNK_SIZE;
			}
			return result;
		}
		try{
			var binaryString = window.atob(str);
			var binaryLen = binaryString.length;
			var bytes = new Uint8Array(binaryLen);
			for (var i = 0; i < binaryLen; i++) {
			    var ascii = binaryString.charCodeAt(i);
			    bytes[i] = ascii;
			}
			
			var byteArray = new Uint8Array(bytes); // 切换数据编码为
			byteArray = pako.ungzip(bytes); // 调用 pako 的方法解压数据
			return Utf8ArrayToStr(byteArray);
		}catch(e){
			//TODO handle the exception
			console.log(e)
			return str
		}
	}
	
	zipStr(str) {
		var binaryString = pako.gzip(str, { to: 'string' });
		return btoa(binaryString);
	}
}

测试代码：

let yasuo=new zip().zipStr("我是中国人");
console.log(yasuo)
console.log(new zip().unzipStr(yasuo))

结果：

H4sIAAAAAAAAA3vWMfHZjPVPdqx9Onvvk127AGTv6cwPAAAA
mytest.html:70 我是中国人

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