滚动100％屏幕高度时标题大小调整 - javascript

Question

这是我想添加100％而不是像素的代码。有谁能帮我这个代码？我在javascript上很糟糕

function init() {
  window.addEventListener('scroll', function(e) {
    var distanceY = window.pageYOffset || document.documentElement.scrollTop,
      shrinkOn = 100,
      header = document.querySelector("header");
    if (distanceY > shrinkOn) {
      classie.add(header, "smaller");
    } else {
      if (classie.has(header, "smaller")) {
        classie.remove(header, "smaller");
      }
    }
  });
}
window.onload = init();

<header>
  <div class="navcontainer">
    <div id="logo"></div>
    <ul id="menu">
      <li data-menuanchor="firstPage"><a href="#firstPage">POČETNA</a>
      </li>
      <li data-menuanchor="secondPage"><a href="#secondPage">BIOGRAFIJA</a>
      </li>
      <li data-menuanchor="3rdPage"><a href="#3rdPage">RURALNI MOTIVI</a>
      </li>
      <li data-menuanchor="4thPage"><a href="#4thPage">REČNI MOTIVI</a>
      </li>
      <li data-menuanchor="5thPage"><a href="#5thPage">GRADSKI MOTIVI</a>
      </li>
      <li data-menuanchor="lastPage"><a href="#lastPage">KONTAKT</a>
      </li>
    </ul>
  </div>
</header>

Answer 1

您无法使用100%，但可以使用window.innnerHeight

来执行此操作

function init() {
    window.addEventListener('scroll', function(e){
        var distanceY = window.pageYOffset || document.documentElement.scrollTop,
            shrinkOn = window.innerHeight,
            header = document.querySelector("header");
        if (distanceY > shrinkOn) {
            classie.add(header,"smaller");
        } else {
            if (classie.has(header,"smaller")) {
                classie.remove(header,"smaller");
            }
        }
    });
}
window.onload = init();