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JS基於VML技術實現的五角星禮花效果程式碼_javascript技巧

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發布： 2016-05-16 15:35:11

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本文實例講述了JS基於VML技術實現的五角星禮花效果程式碼。分享給大家參考，具體如下：

這裡示範的五角星禮花，基於HTML js VML技術共同編寫實現，打開頁面即可看到禮花綻放效果，五角星符號可以換成其它的符號，本效果可輕鬆修改成煙火升空爆炸特效，不過你要事先製作一個煙火的GIF小圖，然後替換掉五角星。

運作效果截圖如下：

線上示範網址如下：

http://demo.jb51.net/js/2015/js-vml-wjx-style-demo/

具體程式碼如下：

<HTML>
<HEAD>
<TITLE>五角星礼花</TITLE>
<META http-equiv=Content-Type content="text/html; charset=gb2312">
</HEAD>
<BODY bgColor=#fef4d9>
<CENTER>
<TABLE borderColor=#00FF00 border=5 borderlight="green">
 <TBODY>
 <TR>
 <TD align=middle><!--[if IE ]>
   <STYLE type=text/css>BODY {
    OVERFLOW: hidden
}
v\:* {
    BEHAVIOR: url(#default#VML)
}
</STYLE>
<![endif]--><!--[if IE ]>
<SCRIPT language=JavaScript>
colors = new Array();
colors[0] = new Array('yellow', 'lime');
colors[1] = new Array('silver', 'green')
colors[2] = new Array('silver', 'blue');
colors[3] = new Array('silver', 'purple');
colors[4] = new Array('purple', 'white');
colors[5] = new Array('blue', 'silver');
colors[6] = new Array('red', 'fuchsia');
colors[7] = new Array('yellow', 'red');
// Define the maximum number of fire arrows
maximum = 1000;
vmlobj=''; 
 for(i = 0; i < 12; i++){ 
 vmlobj += '<div id="ster'+i+'" style="position:absolute; left:-50px; top-50px; visibility:hidden; z-index:50;">';
 vmlobj += '<v:shape style="width:15px; height:15px;" fillcolor="yellow" coordorigin="0,0" coordsize="200 200">';
 vmlobj += '<v:path v="m 8,65 l 72,65, 92,11, 112,65, 174,65, 122,100, 142,155,92,121, 42,155, 60,100 x e"/>';
 vmlobj += '<v:stroke on="false" /></v:shape></div>';
 }
document.write(vmlobj); vmlobj = null;
aantal = 0;
function begin()
{
try {
 if(aantal == maximum){ return;}
 kleurschema = Math.floor(Math.random() * colors.length);
 posLinks = Math.floor(Math.random() * (document.body.clientWidth - 180));
 posLinks = (posLinks < 170)&#63; 170: posLinks;
 posBoven = Math.floor(Math.random() * (document.body.clientHeight - 180));
 posBoven = (posBoven < 170)&#63; 170: posBoven;
 straal = 0; uiteen = true; teller = 1; flikkereffect = false;
 for(var i = 0; i < 12; i++){
 document.getElementsByTagName('shape')[i].setAttribute('fillcolor', colors[kleurschema][0]);
 document.getElementById('ster'+i).style.visibility = 'hidden'; // 5.0 fix
 document.getElementById('ster'+i).style.left = posLinks;
 document.getElementById('ster'+i).style.top = posBoven;
 }
 document.getElementById('ster0').style.top = (document.body.clientHeight - 20); 
 document.getElementById('ster0').style.visibility = 'visible';
 omhoog();
} catch(e){}
}
function omhoog()
{
try {
 positie = parseInt(document.getElementById('ster0').style.top);
 if(positie > posBoven){
 document.getElementById('ster0').style.top = (positie - 25); 
 setTimeout('omhoog()', 50);
 } else {
  for(i = 1; i < 12; i++){
  document.getElementById('ster'+i).style.top = positie;
  document.getElementById('ster'+i).style.visibility = 'visible';
  } 
 uiteenspatten();
 }
} catch(e){}
}
function uiteenspatten()
{
try {
 if(straal > 120 && straal % 10 == 0){ 
 flikkereffect = true;
 teller = (teller == colors[kleurschema].length)&#63; 0: (teller+1);
 }
 for(var i = 0; i < 12; i++){
 var hoek = i * 30; 
 var piHoek = Math.PI - Math.PI / 180 * hoek;
 var links = posLinks + Math.round(straal * Math.sin(piHoek)); 
 var boven = positie + Math.round(straal * Math.cos(piHoek));
 document.getElementById('ster'+i).style.left = links;
 document.getElementById('ster'+i).style.top = boven;
 if(flikkereffect){
 document.getElementsByTagName('shape')[i].setAttribute('fillcolor', colors[kleurschema][teller]);
 }
 }
 if(straal < 160 && uiteen){
 straal += (straal < 120)&#63; 10: 5;
 setTimeout('uiteenspatten()', 50);
 }
 else if(straal > 120){
 uiteen = false; straal -= 5;
 setTimeout('uiteenspatten()', 50);
 }
 else if(straal <= 120){
 for(var i = 0; i < 12; i++){
 document.getElementById('ster'+i).style.visibility = 'hidden';
 }
 aantal++;
 setTimeout('begin()', 500);
 }
} catch(e) {}
}
window.onload=begin;
</SCRIPT>
<![endif]--></TD></TR></TBODY></TABLE></CENTER>
</BODY>
</HTML>

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希望本文所述對大家JavaScript程式設計有所幫助。