代码实现不了效果
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
html,body{width: 100%;height: 100%;background:#001122; }
</style>
</head>
<body>
<svg width="100%" height="100%" viewBox="-960 -540 1920 1080" preserveAspectRatio="xMidYMid slice">
<defs>
<polygon id="star" points="0 -10 2 -2 10 0 2 2 0 10 -2 2 -10 0 -2 -2" fill="white"> </polygon>
</defs>
<g id="real">
<g id="star-group"> </g>
<g id="moon-group">
<mask id="moon-mask">
<circle r="100" cx="-250" cy="-150" fill="white"></circle>
<circle r="100" cx="-200" cy="-200" fill="black"></circle>
</mask>
<circle r="100" cx="-250" cy="-150" fill="white" mask="url(#moon-mask)"></circle>
</g>
<g id="light-tower" transform="translate(250,0)">
<defs>
<linearGradient id="tower" x1="0" y1="0" x2="1" y2="0">
<stop offset="0" stop-color="#999"></stop>
<stop offset="1" stop-color="#333"></stop>
</linearGradient>
<radialGradient id="light" cx="0.5" cy="0.5" r="0.5">
<stop offset="0" stop-color="rgba(255,255,255,.8)"></stop>
<stop offset="1" stop-color="rgba(255,255,255,0)"></stop>
</radialGradient>
<clipPath id="light-clip">
<polygon points="0 0 -400 -15 -400 15" fill="rgba(255,0,0,0.5)">
<animateTransform
attributeName="transform"
attributeTpye="XML"
type="rotate"
from="0"
to="360"
dur="10s"
repeatCount="indefinite"
>
</animateTransform>
</polygon>
<circle cxc="0" cy="0" r="2"></circle>
</clipPath>
</defs>
<polygon points="0 0 5 50 -5 50" fill="url(#tower)"></polygon>
<ellipse cx="0" cy="0" rx="300"ry="100" fill="url(#light)"clip-path="url(#light-clip)"></ellipse>
</g>
</g>
<g id="reflact" transform="translate(0 50)"mask="url(#fading)">
<defs>
<linearGradient id="fade" x1="0" y1="0" x2="1" y2="0">
<stop offset="0" stop-color="rgba(255,255,255,.3)"></stop>
<stop offset="0.5" stop-color="rgba(255,255,255,.3)"></stop>
</linearGradient>
<mask id="fading">
<rect x="-400" y="0" width="800" height="300" fill="url(#fade)"></rect>
</mask>
</defs>
<use xlink:href="#real" transform="scale(1,-1) translate(0 -50)"></use>
</g>
<line x1="-400" y1="50" x2="400" y2="50" stroke="white"></line>
</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");
function use(origin){
var _use = document.createElementNS(SVG_NS,"use");
_use.setAttributeNS(XLINK_NS,"xlink:href","#"+origin.id);
return _use;
}
function random(min,max){
return min + (max - min)*Math.random();
}
renderStar();
function renderStar(){
var starRef = document.getElementById("star");
var starGroup = document.getElementById("star-group");
var starConut = 500;
var star;
while(starConut--){
star =use(starRef);
star.setAttribute("opacity",random(0.1,0.4));
star.setAttribute("transform","translate("+ random(-400,400)+ ","+ random(-300,50)+")" + "scale("+ random(0.1,0.6)+")");
starGroup.appendChild(star);
}
}
</script>
</body>
</html>