js implements the window function code for closing the js pop-up layer

<script type="text/javascript">
function toggle() {
  theObj = document.getElementById(&#39;Sunyanzi&#39;).style;
  if (  theObj.display == "none" ) theObj.display = "block"; else theObj.display = "none";
}
</script>
<p id="Sunyanzi" style="display:none">你看我出现了~~~</p>
<br />
<input type="button" onclick="toggle()" value="点一下试试看 ...?" />

//创建你的弹出层   
    var dvMsg = document.createElement("p");  
    strHtml =  "<p class=&#39;####&#39;>弹出层内容</p>" 
    strHtml += " <p class=&#39;####&#39;><input type=&#39;button&#39; value=&#39;关闭&#39; onclick=&#39;btnclick()&#39;></p>"
    dvMsg.innerHTML = strHtml;    
    document.body.appendChild(dvMsg);
// 关闭按钮     
btnclick = function (){                       
    document.body.removeChild(dvMsg);

<p id="tanchu">弹出层内容</p>

function open(){
document.getElementById(tanchu).style.display="";  //显示
}
function close(){
document.getElementById(tanchu).style.display="none";  //不显示（页面初始化的时候同样加载一遍）
}