please give me a open xmind file demo ?

[jiuyuehe]

I have some problems when I use this sdk to load / open xxx.xmind file. many times but is faile all way ! thank you !

` var tfile = document.getElementById("tfile");

tfile.addEventListener('change', (event) => {

console.log(event); var file = event.target.files[0];

console.log(file);

var workbookFromFile = xmind.open(file);

console.log("workbookFromFile",workbookFromFile)`