在javascript中加入Html代码的特效实现方法 dn001 2009-06-21 08:24:30 <!-- http://www.knowsky.com --> <!-- bbs http://bbs.knowsky.com --> <!--要完成此效果需要两个步骤 第一步：把如下代码加入到<body>区域中--> <body> <script language="JavaScript"> <!-- N = 40; Y = new Array(); X = new Array(); S = new Array(); A = new Array(); B = new Array(); M = new Array(); V = (document.layers)?1:0; iH=(document.layers)?window.innerHeight:window.document.body.clientHeight; iW=(document.layers)?window.innerWidth:window.document.body.clientWidth; for (i=0; i < N; i++){ Y[i]=Math.round(Math.random()*iH); X[i]=Math.round(Math.random()*iW); S[i]=Math.round(Math.random()*5+2); A[i]=0; B[i]=Math.random()*0.1+0.1; M[i]=Math.round(Math.random()*1+1); } if (V){ for (i = 0; i < N; i++) {document.write("<LAYER NAME='sn"+i+"' LEFT=0 TOP=0 BGCOLOR='#FFFFF0' CLIP='0,0,"+M[i]+","+M[i]+"'></LAYER>")} } else{ document.write('<div style="position:absolute;top:0px;left:0px">'); document.write('<div style="position:relative">'); for (i = 0; i < N; i++) {document.write('<div id="si" style="position:absolute;top:0;left:0;width:'+M[i]+';height:'+M[i]+';background:#fffff0;font-size:'+M[i]+'"></div>')} document.write('</div></div>'); } function snow(){ var H=(document.layers)?window.innerHeight:window.document.body.clientHeight; var W=(document.layers)?window.innerWidth:window.document.body.clientWidth; var T=(document.layers)?window.pageYOffset:document.body.scrollTop; var L=(document.layers)?window.pageXOffset:document.body.scrollLeft; for (i=0; i < N; i++){ sy=S[i]*Math.sin(90*Math.PI/180); sx=S[i]*Math.cos(A[i]); Y[i]+=sy; X[i]+=sx; if (Y[i] > H){ Y[i]=-10; X[i]=Math.round(Math.random()*W); M[i]=Math.round(Math.random()*1+1); S[i]=Math.round(Math.random()*5+2); } if (V){document.layers['sn'+i].left=X[i];document.layers['sn'+i].top=Y[i]+T} else{si[i].style.pixelLeft=X[i];si[i].style.pixelTop=Y[i]+T} A[i]+=B[i]; } setTimeout('snow()',10); } //--> </script> <!--第二步：把“onLoad="snow()"”加在<body>标记里 例如：--> <body onLoad="snow()" bgcolor=#000000>
