将目标元素在标准元素前|后插入

api的应用场景是：在基准的元素前|后插入一个目标元素

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关于ZYC.dom.g的资料：http://zhangyaochun.iteye.com/blog/1439262

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关于insertBefore的理解：http://zhangyaochun.iteye.com/blog/1472621

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/*
*insertBefore*
*@function*
*@param {String|HTMLElement} newEle  the new element to insert*
*@param {String|HTMLElement} existEle the base existEle*
*/
ZYC.dom.insertBefore = function(newEle,existEle){
    newEle = ZYC.dom.g(newEle);
    existEle = ZYC.dom.g(existEle);
	existParent = existEle.parentNode;
	if(existParent){
	   existParent.insertBefore(newEle,existEle);
	}
	return newEle;
};

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/*
*insertAfter*
*@function*
*@param {String|HTMLElement} newEle  the new element to insert*
*@param {String|HTMLElement} existEle the base existEle*
*/
ZYC.dom.insertAfter = function(newEle,existEle){
    newEle = ZYC.dom.g(newEle);
    existEle = ZYC.dom.g(existEle);
	existParent = existEle.parentNode;
	if(existParent){
	   existParent.insertBefore(newEle,existEle.nextSibling);
	}
	return newEle;
};

其实原理还是那个原生的insertBefore

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