//打開一個(gè)鏈接
window.open("www.baidu.com", "_self");

//清空頁(yè)面，并寫入東西
document.write("<p></p>");

window.navigator.userAgent

window.location = "www.baidu.com";

js制作側(cè)邊欄（跟隨滾動(dòng)）

window.resize = window.onload = window.onscroll = function() {
  var oDiv = document.getElementById("div1");
  //可視區(qū)頂部距離網(wǎng)頁(yè)頂部的距離
  var scrollTop = document.documentElement.scrollTop || document.body.scrollTop;
  //(可視區(qū)的高度 - 物體本身高度)/2
  var t = (document.documentElement.clientHeight - oDiv.offsetHeight)/2;
//需要設(shè)置oDive 的position為absolute
oDiv.style.top = scrollTop + t +'px';
}
//此時(shí)拖動(dòng)的時(shí)候有抖動(dòng)現(xiàn)象
//設(shè)置position:fixed --> ie6不支持此固定定位

回到頂部按鈕

window.load = function() {
  var timer = null;
  var bSys = true;
  
  windwo.onscroll = function() {
    if(!bSys) {
      clearinterval(timer);
    }
    bSys = false;
  }
  var oBtn = document.getElementById("btn1");
  oBtn.onclick = function() {
    timer = setInterval(function(){
      var scrollTop = document.documentElement.scrollTop || document.body.scrollTop;
      var iSpeed = Math.floor(-scrollTop / 8);
      if(scrollTop == 0) {
        clearInterval(timer);
      } 
      //系統(tǒng)滾動(dòng)
      bSys = true;
      document.documentElement.scrollTop= document.body.scrollTop = scrollTop + iSpeed;
      }, 30);
  }

  window.onscroll
}