????function?getclsname(clsname,parent){
????	var?oparent=parent?document.getElementById(parent):document,
????		eles=[],
????		elements=oparent.getElementsByTagName('*');
????	for(var?i=0;i<elements.length;i++){
????		if(elements[i].className==clsname){
????			eles.push(elements[i]);
????		}
????	}
????	return?eles;
????}
????function?getstyle(ele,sty){
????	if(ele.currentStyle){
????		return?ele.currentStyle[sty];
????	}else{
????		return?window.getComputedStyle(ele,null)[sty];
????	}
????}
????
????
????????window.onload?=?function?()?{
????????	var?lis=document.getElementsByTagName('li');
????????	//console.log(getclsname('toptitle',null)[0]);
????????	var?div_1=getclsname('toptitle',null)[0];//document.getElementsByTagName('ul')[0].getElementsByTagName('div')[0],
????????		wd=parseInt(getstyle(div_1,'height'));
????????	for(var?i=0;i<lis.length;i++){
????????		lis[i].onmouseover=function(){
????????			this.getElementsByTagName('div')[0].style.display='block';
????????			this.getElementsByTagName('span')[0].className='my_span';
????????			var?a=this.getElementsByTagName('div')[0].offsetHeight;
????????			//var?a=this.getclsname('submenu',null)[0];
????????			console.log(a);
????????		}
????????		lis[i].onmouseleave=function(){
????????			this.getElementsByTagName('div')[0].style.display='none';
????????			this.getElementsByTagName('span')[0].className='';
????????		}
????????		var?h=i*parseInt(getstyle(lis[i],'height'))+wd;
????????	}
????????}

這一段的，this.getclsname('submenu',null)[0];，

這句會報錯：Uncaught TypeError: this.getclsname is not a function，

如果換成了，this.getELementsByTagName('div')[0]就沒有問題呢？

非常感謝！