Use hitTest in js

Hi,
I would like to detect the collision of two clips (b1 and v1) when clicking on a button (btvo). In js so that it works in html5. I tried with this code, but it doesn’t work you would have a solution? 

this.btvo.addEventListener("click", playClicked.bind(this));
function playClicked() {

var pt = v1.localToLocal(100,0,b1);
if (b1.hitTest(pt.x, pt.y)) { this.score.text = "OK"}

if (this.b1.hitTest(this.v1))

else {this.score.text = "No"}
}

Thank you