Controlling layers in javascript_javascript skills

The development of layers is more important in practical applications, such as floating advertisements, etc. I will briefly discuss it here.

1. Control the display or hiding of layers

Both methods actually control the style.

Method 1: Control the display attribute

This is a layer, can you see it, haha.

Show
Close



Method 2 Control the visibility attribute




Above The code uses the setTimeout method to control the layer to close after 4 seconds.


2. Control the movement of the layer, similar to floating ads

Mainly by controlling the values ​​of the top and left attributes in the layer style, by randomly generating different values, It looks like it's in motion.

Let me move.



<script> <BR>function show(status) <BR>{ <BR> document.getElementById("div1").style.display = status; <BR>} <br><br></script><script> <BR>function show(status) <BR>{ <BR> document.getElementById("div1").style.visibility = status; <BR>} <br><br><div id="div1" style="left:10px;top:200px;width:250;height:100;z-index:2;visibility=hideen;"> <BR> 这是一层,能看见吗,呵呵. <BR> <BR><a href=# onClick="show('visible);">显示 <BR><a href=# onClick="show('hidden')">关闭 <br><br><BR>如果要控制层定时关闭的话，可以加上： <br><br>function setTimeStart() <BR> 10 { <BR> 11 window.setTimeout(hiddenTips,4000); <BR> 12 }^ <BR></script> is called through the setTimeout method and runs every few seconds to achieve the purpose of continuous movement. <script> <BR>var a=200, b=100; <BR>var c=0.1; <BR>var d=5; <BR>var t=0; <br><br>function float_1() <BR>{ <BR> var random1 = 100*Math.random(); <BR> var random2 = 100*Math.random(); <br><br> var float_1 = document.all ? document.all.float_1.style : document.float_1; <BR> float_1.left = Math.round(a*Math.cos(t)*Math.cos(t/d)+a)+random1; <BR> float_1.top = Math.round(b*Math.sin(t)+b)+random2; <br><br> t+=c; <br><br> setTimeout("float_1()", 500); <br><br>} <BR></script>