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Use the project created by yeoman, then download the iscroll4 from bower, and call it directly with native js

var myScroll;
function loaded(){
    myScroll = new iScroll('wrapper');
}
document.addEventListener('touchmove', function(e){
    e.preventDefault();
}, false);
document.addEventListener('DOMContentLoaded', function(){
    setTimeout(loaded, 200);
}, false);

But it has no effect. . .
I am new to angularJS, and the teacher who tutors me is very busy now. So I would like to ask you for advice on how to use it.
Console error: Uncaught ReferenceError: IScroll is not defined