Popper.js 使用方法

I'm a button
I'm a tooltip

var  reference = document.querySelector('#button');  //需要弹框的按钮
var  popper = document.querySelector("#tooltip");   //弹框下拉框
popinstance= Popper.createPopper(reference,popper, {
    placement: "bottom-start",
    modifiers: {
       
    }
}
});