iview的Affix组件没有按照预期效果固定

<template>
<Affix :offset-bottom="10">
   <Button style="text-align:center" type="primary">下一步</Button>
</Affix>
</template>
mounted(){
	window.addEventListener("scroll", this.initAffix, true);
}
mehtods:{
	initAffix() {
      if (!this.affixInit) {
        //affix组件有bug，需要触发一次resize事件才能正常
        this.affixInit = true;
        if (document.createEvent) {
          let event = document.createEvent("HTMLEvents");
          event.initEvent("resize", true, true);
          window.dispatchEvent(event);
        } else if (document.createEventObject) {
          window.fireEvent("onresize");
        }
      }
    }
}