var SVG_NS = "http://www.w3.org/2000/svg";var XLINK_NS = http://www.w3.org/1999/xlink;

document.createElementNS(SVG_NS,tagName);

element.appendChild(childElement)

element.setAttribute(name,value);element.getAttribute(name);

element.setAttributeNS(XLINK_NS,'xlink:href',value);

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<style>#box{ height: 300px; width: 300px; background: hsl(20,40%,90%); background-image:linear-gradient(90deg,#fb3 11px,transparent 0), linear-gradient(90deg,#ab4 23px,transparent 0), linear-gradient(90deg,#655 41px,transparent 0); background-size: 41px 100%,61px 100%,83px 100%; } </style><div id="box"></div><script>var oSvg = createTag('svg',{'version':'1.1','xmls':'http://www.w3.org/2000/svg',height:'100%',width:'100%'});var oBox = document.getElementById('box');var W = parseInt(getComputedStyle(oBox).width);var H = parseInt(getComputedStyle(oBox).height);var appearance = { 'dis':H/3, 'r0':H/8,'r':H/10, 'x0':W/2,'y0':H/2, 'fontSize':H/20, 'bg0':'hsla(0,0%,100%,.6)','bg':'hsla(0,0%,100%,.3)', 'color0':'hsl(210,13%,30%)','color':'hsl(210,13%,30%)', 'borderColor0':'rgba(0,0,0,0.3)','bordercolor':'rgba(0,0,0,0.3)', 'strokWidth0':3,'strokWidth':2, 'lineColor':'rgba(0,0,0,0.3)','lineWidth':1,'lineDashed':'5,5'}var data = { text:'前端開發', children:[  {text:'HTML',url:'http://www.cnblogs.com/xiaohuochai/p/5203223.html'},  {text:'CSS',url:'http://www.cnblogs.com/xiaohuochai/p/5249139.html'},  {text:'JS',url:'http://www.cnblogs.com/xiaohuochai/p/5613593.html'},  {text:'ES6',url:'http://www.cnblogs.com/xiaohuochai/p/7233392.html'},  {text:'HTTP',url:'http://www.cnblogs.com/xiaohuochai/p/6392010.html'},  {text:'NodeJS',url:'http://www.cnblogs.com/xiaohuochai/p/6940560.html'},  {text:'前端工具',url:'http://www.cnblogs.com/xiaohuochai/p/6666415.html'}, ], }addChildenTags();addCenterTag();oBox.appendChild(oSvg);function createTag(tag,objAttr){ var oTag = document.createElementNS('http://www.w3.org/2000/svg',tag); 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    }    }}function elasticMove(obj,str){ var circle = obj.getElementsByTagName('circle')[0]; var r0 = circle.getAttribute('r'); var r = Number(str); //聲明步長值 var step = 0; //聲明彈性距離 var len = r - r0; //聲明彈性系數 var k = 0.7; //聲明損耗系數 var z= 0.7; //聲明當前值 var cur = r0; clearInterval(circle.timer); circle.timer = setInterval(function(){  //獲取當前值cur  cur = circle.getAttribute('r');  //更新彈性距離  len = r - cur;  //彈力影響  step += len*k;  //阻力影響  step = step*z;  //賦值  circle.setAttribute('r',Number(cur) + step);  //當元素的步長值接近于0，并且彈性距離接近于0時，停止定時器  if(Math.round(step) == 0 && Math.round(len) == 0){   circle.setAttribute('r',r);   clearInterval(circle.timer);   }  },30);}</script>