js实现关闭js弹出层的窗口功能代码

<script type="text/javascript">
function toggle() {
 theObj = document.getElementById('Sunyanzi').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='####'>弹出层内容</p>" 
 strHtml += " <p class='####'><input type='button' value='关闭' onclick='btnclick()'></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）
}