web前端开发是做什么 |
前端开发中的同源是什么意思 |
前端开发都用什么工具 |
html 代码片段
<!DOCTYPE html>
<html>
<head>
<meta charset=”utf-8″>
<meta http-equiv=”X-UA-Compatible” content=”IE=edge”>
<title></title>
<style>
html,body{padding: 0; margin: 0; width: 100%; height: 100%; background: #012;font-size: 0; line-height: 0}
</style>
</head>
<body>
<svg width=”100%” height=”100%” preserveAspectRatio=”xMinYMin slice”>
<defs>
<polygon id=”star” points=”0 -10 2 -2 10 0 2 2 0 10 -2 2 -10 0 -2 -2″ fill=”white” />
</defs>
<g id=”star-group”></g>
<g id=”ligth-tower” transform=”translate(300 200)”>
<defs>
<linearGradient id=”gradient_1″ x1=”0″ y1=”0″ x2=”1″ y2=”0″>
<stop offset=”0″ stop-color=”rgba(255,255,255,0.6)” />
<stop offset=”1″ stop-color=”rgba(255,255,255,0.9)” />
s </linearGradient>
<linearGradient id=”gradient_2″ x1=”0″ y1=”0″ x2=”1″ y2=”0″>
<stop offset=”0″ stop-color=”rgba(255,255,255,0.2)” />
<stop offset=”1″ stop-color=”rgba(255,255,255,1)” />
</linearGradient>
<clipPath id=”clipPath-1″>
<polygon points=”0 -40 800 0 0 40″ transform=”translate(-800 -60)” />
</polygon>
</clipPath>
</defs>
<!– 灯塔和灯柱 –>
<g>
<polygon points=”-10 0 10 0 0 -60″ fill=”url(#gradient_1)” />
<circle r=”3″ cx=”0″ cy=”-60″ fill=”white” />
<!– 旋转的灯光 –>
<g>
<ellipse rx=”300″ ry=”150″ cx=”0″ cy=”-60″ fill=”url(#gradient_2)” clip-path=”url(#clipPath-1)” />
<animateTransform from=”0 0 -60″ to=”360 0 -60″ type=”rotate” dur=”10s” repeatCount=”indefinite” attributeName=”transform”
begin=”0s”>
</animateTransform>
<!– from=”0,x,y” to=”360,x,y” X,Y就是你的坐标 –>
</g>
</g>
</g>
<!– 绘制月亮 –>
<g id=”moon”>
<defs>
<mask id=”mask-moon”>
<circle r=”100″ cx=”-600″ cy=”-250″ fill=”white” />
<circle r=”100″ cx=”-550″ cy=”-290″ fill=”black” />
</mask>
</defs>
<circle r=”100″ cx=”-600″ cy=”-250″ fill=”yellow” mask=”url(#mask-moon)” />
</g>
</svg>
<script>
var SVG_NS =’http://www.w3.org/2000/svg’;
var XLINK_NS =’http://www.w3.org/1999/xlink’;
var paper =document.querySelector(‘svg’);
var starCount =500;
var width =document.body.clientWidth;
var height =document.body.clientHeight;
var star;
renderStar()
setSVGViewBox()
//绘制星星
function renderStar() {
var starRef =document.querySelector(‘#star’);
var starGroup =document.querySelector(‘#star-group’);
while (starCount–) {
star =use(starRef);
star.setAttribute(‘transform’,’translate(‘+random(-width /2, width /2)+’,’+random(-height /2, height /2)+’)’+’scale(‘+random(0.1,0.8)+’)’);
star.setAttribute(‘opacity’,random(0.1,0.7))
starGroup.appendChild(star)
}
}
//js加载use方法
function use(origon) {
var _use =document.createElementNS(SVG_NS,’use’);
_use.setAttributeNS(XLINK_NS,’xlink:href’,’#’+ origon.id)
return _use
}
//大小数之间的随机
function random(min, max) {
return min +(max – min)*Math.random();
}
//设置svg的宽高
function setSVGViewBox() {
paper.setAttribute(‘viewBox’,-width /2+”+(-height /2)+”+ width +”+ height)
console.log(paper.getAttribute(‘viewBox’));
}
</script>
</body>
</html>
根本慕课网视频制作的,纯粹是当作一个记录,在这个DEMO中,涉及到了许多SVG的知识,基本适口的设置、绘图API、clip-path、mask蒙板的使用、animateTransform动画;
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