js压缩文件读取处理

1.引入必须依赖库jszip+jsutils=>>>建议使用以下版本，其他版本的jszip会报错

<!--zip文件读取-->

<script src="https://cdn.bootcss.com/jszip/2.1.0/jszip.min.js"></script>

<script src="https://cdn.bootcss.com/jszip-utils/0.0.2/jszip-utils.min.js"></script>

2.实例化jsZip对象并读取文件:

<script>

JSZipUtils.getBinaryContent('http://static.yygo.tv/Gift/o_1c3239h691nd2uohmf414b8dlia.zip', function (err, data) {

if (err) {

throw err; // or handle err

}

var zip = new JSZip(data);

JSZipUtils.getBinaryContent('read.zip', function (err, data) {
if (err) {
throw err; // or handle err
}
var zip = new JSZip(data);
function Uint8ArrayToString(fileData){
var dataString = "";
for (var i = 0; i < fileData.length; i++) {
dataString += String.fromCharCode(fileData[i]);
}
return dataString

}
var dirname = 'read';
// 转换格式字符串
var str = Uint8ArrayToString(zip.folder().files[dirname+'/package.json']._data.getContent());
//将字符串转换对象
var res = JSON.parse(str);

console.log(res)

</script>

Tip=>jsZip读取的data为对象，buffer参数为每个图片的文件名，可通过zip.file('')||zip.folder()读取文件名或文件夹

 

Uint8Array转字符串

function Uint8ArrayToString(fileData){
var dataString = "";
for (var i = 0; i < fileData.length; i++) {
dataString += String.fromCharCode(fileData[i]);
}

return dataString

}

字符串转Uint8Array

function stringToUint8Array(str){
var arr = [];
for (var i = 0, j = str.length; i < j; ++i) {
arr.push(str.charCodeAt(i));
}

var tmpUint8Array = new Uint8Array(arr);
return tmpUint8Array
}

string转ArrayBuffer

function str2ab(str) {
var buf = new ArrayBuffer(str.length * 2); // 每个字符占用2个字节
var bufView = new Uint16Array(buf);
for (var i = 0, strLen = str.length; i < strLen; i++) {
bufView[i] = str.charCodeAt(i);
}
return buf;
}

ArrayBuffer转String

function ab2str(buf) {
  return String.fromCharCode.apply(null, new Uint8Array(buf));
}