近日，因工作需要，需要通过点击某个元素后， 动态创建一个DOM元素并显示，因此写了一些相关的JS函数，在此记录，以作备忘：

function getElement(obj) { return typeof obj=='string'?document.getElementById(obj):obj; } function getObjectPosition(obj) { obj=typeof obj==='string'?getElement(obj):obj; if(!obj) { return; } var position=''; if(obj.getBoundingClientRect) //For IEs { position=obj.getBoundingClientRect(); return {x:position.left,y:position.top}; } else if(document.getBoxObjectFor) { position=document.getBoxObjectFor(obj); return {x:position.x,y:position.y}; } else { position={x:obj.offsetLeft,y:obj.offsetTop}; var parent=obj.offsetParent; while(parent) { position.x+=obj.offsetLeft; position.y+=obj.offsetTop; parent=obj.offsetParent; } return position; } } function addEventHandler(oTarget, sEventType, fnHandler) { if (oTarget.addEventListener) { oTarget.addEventListener(sEventType, fnHandler, false); } else if (oTarget.attachEvent) //for IEs { oTarget.attachEvent("on" + sEventType, fnHandler); } else { oTarget["on" + sEventType] = fnHandler; } } function removeEventHandler(oTarget,sEventType,fnHandler) { if(oTarget.removeEventListener) { oTarget.removeEventListener(sEventType,fnHandler,false) } else if(oTarget.detachEvent) //for IEs { oTarget.detachEvent(sEventType,fnHandler); } else { oTarget['on'+sEventType]=undefined; } } function dynCreateDomObject(domParams) { if(getElement(domParams.domId)) { childNodeAction('remove',domParams.parentNode,domParams.domId); } var dynObj=document.createElement(domParams.domTag); with(dynObj) { //id也可以通过otherAttributes传入，但是出于ID的特殊性，此处仍然采用 //JSON对象传入，并以DOM ID属性附件 id=domParams.domId; innerHTML=domParams.content; //innerHTML是DOM属性，而id等是元素属性，注意区别 } if(null!=domParams.otherAttributes) { for(var i=0;i<domParams.otherAttributes.length;i++) { var otherAttribute =domParams.otherAttributes[i]; dynObj.setAttribute(otherAttribute.attrName,otherAttribute.attrValue); } } if(null!=domParams.eventRegisters) { for(var i=0;i<domParams.eventRegisters.length;i++) { var eventRegister =domParams.eventRegisters[i]; addEventHandler(dynObj,eventRegister.eventType,eventRegister.eventHandler); } } try { childNodeAction('append',domParams.parentNode,dynObj); } catch($e) { } return dynObj; } function childNodeAction(actionType,parentNode,childNode) { if(!parentNode) {return; } parentNode=typeof parentNode==='string'?getElement(parentNode):parentNode; childNode=typeof childNode==='string'?getElement(childNode):childNode; if(!parentNode || !childNode) {return;} var action=actionType.toLowerCase(); if( null==actionType || action.length<=0 || action=='append') { action='parentNode.appendChild'; } else { action='parentNode.removeChild'; } try { eval(action)(childNode); } catch($e) { alert($e.message); } }

使用示例：

var htmlAttributes= [{attrName:'class',attrValue:'样式名称'} //for IEs,{attrName:'className',attrValue: '样式名称'} //for ff] var domParams={domTag:'div', content:'动态div的innerHTML', otherAttributes:htmlAttributes};var newHtmlDom=dynCreateDomObject(domParams);//通过setAttribute('style','position:absolute.....................')//的形式来指定style没有效果，只能通过如下形式,jiongnewHtmlDom.style.zIndex='8888';newHtmlDom.style.position='absolute';newHtmlDom.style.left='100px';newHtmlDom.style.top='200px';