A simple example of JavaScript writing page semi-transparent mask effect

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A simple example of JavaScript writing page semi-transparent mask effect_javascript skills

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May 16, 2016 pm 03:01 PM

divjavascripttransparentMask

半透明遮罩层效果基本上都是使用插件实现的，下面为大家分享下使用原生js实现半透明遮罩效果，感兴趣的朋友可以参考下哈，希望对你熟悉原生js有所帮助

<div > 
<h4 id="span-现在注册-span-span-关闭-span"><span>现在注册</span><span >关闭</span></h4> 
<p> 
<label> 用户名</label> 
<input type="text" class="myinp" onmouseover="this.style.border='1px solid #f60'" onfoucs="this.style.border='1px solid #f60'" onblur="this.style.border='1px solid #ccc'" /> 
</p> 
<p> 
<label> 密　码</label> 
<input type="password" class="myinp" onmouseover="this.style.border='1px solid #f60'" onfoucs="this.style.border='1px solid #f60'" onblur="this.style.border='1px solid #ccc'" /> 
</p> 
<p> 
<input type="submit" value="注册" class="sub" /> 
<input type="reset" value="重置" class="sub" /> 
</p> 
</div> 
<div ></div><!-- 遮罩层div--> 
<script type="text/javascript"> 
var myAlert = document.getElementById("alert"); 
var myMask=document.getElementById('mask'); 
var reg = document.getElementById("content").getElementsByTagName("a")[0]; 
var mClose = document.getElementById("close"); 
reg.onclick = function() 
{ 
myMask.style.display="block"; 
myAlert.style.display = "block"; 
myAlert.style.position = "absolute"; 
myAlert.style.top = "50%"; 
myAlert.style.left = "50%"; 
myAlert.style.marginTop = "-75px"; 
myAlert.style.marginLeft = "-150px"; 
document.body.style.overflow = "hidden"; 
} 
mClose.onclick = function() 
{ 
myAlert.style.display = "none"; 
myMask.style.display = "none"; 
} 
</script> 
</body> 
</html>

全屏幕遮盖

<!DOCTYPE html>
<style>
#mask {
 position:fixed;width:100%;
 top:0px;left:0px;
 _position:absolute;
 _top:expression(documentElement.scrollTop);
 background:rgba(0,0,0,0.5);
 background:transparent\9;
 filter:progid:DXImageTransform.Microsoft.Gradient(
 startColorStr=#80000000,endColorStr=#80000000
 );
 display:none;
}
#mask_td {text-align:center;}
</style>
<img src="/static/imghwm/default1.png"  data-src="http://web-tinker.com/images/TheMagicConch.jpg"  class="lazy"
  style="max-width:90%" id="img" 
/>
<table id="mask"><tr><td id="mask_td"></td></tr></table>
<script>
//判断浏览器
var isIE=navigator.userAgent.match(/MSIE (\d)/i);
isIE=isIE&#63;isIE[1]:isIE;
//声明变量
var img,mask;
//获取元素
img=document.getElementById("img");
mask=document.getElementById("mask");
mask.td=document.getElementById("mask_td");
//计算mask的大小
mask.setSize=function(){
 //获取文档可见区域宽度并设置到mask上
 var de=document.documentElement;
 mask.style.width=de.clientWidth+"px"
 mask.style.height=de.clientHeight+"px";
};
//添加show方法
mask.show=function(){
 //隐藏页面的滚动条
 document[
 isIE<9&#63;"documentElement":"body"
 ].style.overflow="hidden";
 //计算mask的大小
 mask.setSize();
 //显示
 mask.style.display=isIE==6&#63;"block":"table";
};
//添加hide方法
mask.hide=function(){
 //显示页面滚动条
 document[
 isIE<9&#63;"documentElement":"body"
 ].style.overflow="";
 //清空里面的内容
 mask.td.innerHTML="";
 //隐藏
 mask.style.display="none";
};
//添加append方法
mask.append=function(e){
 //在mask的TD里面添加内容哦你
 mask.td.appendChild(e);
};
//点击mask关闭
mask.onclick=function(e){
 //判断事件来源，如果是空白区域被点击了就关闭mask
 e=e||event;
 (e.target||e.srcElement)==mask.td&&mask.hide();
};
//窗体大小改变时也改变mask的大小
window.onresize=function(){
 mask.setSize();
};
//点击图片的事件
img.onclick=function(){
 //创建一个图片对象
 var o=new Image;
 //设置图片的地址
 o.src=img.src;
 //在mask内添加内容
 mask.append(o);
 //显示mask
 mask.show();
};
</script>

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