<script>function hasClass(node,oclass){var oname=node.className.split(/\s+/);for (var i = 0; i < oname.length; i++) {if(oname[i]==oclass){return true;}};return false;}function addClass(node,oclass){if(hasClass(node,oclass)){return false;}else{node.className+=" "+oclass;}}function removeClass(node,oclass){var oname= new RegExp('(\\s|^)'+oclass+'(\\s|$)');if(hasClass(node,oclass)){var aclass=node.className;node.className=aclass.replace(oname,"");}else{return false;}}// var //opan=document.querySelector(".panel_parent"),function addEvent(obj,even,fn){return obj.addEventListener?obj.addEventListener(even,fn,false):obj.attachEvent("on"+even,fn);}function unaddEvent(obj,even,fn){return obj.removeEventListener?obj.removeEventListener(even,fn,false):obj.detachEvent("on"+even,fn);}(function(){var Mycanvas=document.getElementById("ocanvas"),_context=Mycanvas.getContext('2d'),opanel=document.querySelector(".panel_parent"),opic=document.querySelectorAll(".pic"),owidht=window.innerWidth,oheight=window.innerHeight;for (var i = 0; i < opic.length; i++) {addEvent(opic[i],"click",function(e){var img=this.children[0],ck=new Image();src=img.getAttribute("data-src");ck.src=src;ck.onload=function(){var _width=this.width>owidht?owidht:this.width,_height=this.height>oheight?oheight:this.height;Mycanvas.width=_width;Mycanvas.height=_height;_context.drawImage(this,0,0,_width,_height);}removeClass(opanel,"pon");e.stopPropagation();})};if(opanel){addEvent(opanel,"click",function(e){addClass(this,"pon");_context.clearRect(0,0,owidht,oheight);e.stopPropagation();})}})()</script>
演示地址:
，不要做刺猬能不与人结仇就不与人结仇，
