1.创建dom元素的操作

<script type='text/javascript'>
	function main(){
		var mydiv = document.createElement('div');
		mydiv.style.overFlow = 'hidden';
		mydiv.style.width = '200px';
		mydiv.style.left = '0px';
		mydiv.style.paddingTop = '10px';
		mydiv.style.paddingLeft = '4px';
		mydiv.style.height = '66px';
		//mydiv.style.overflowX = 'scroll';
		mydiv.style.overflowY = 'scroll';
		mydiv.style.backgroundColor = '#aabb33';
		mydiv.style.position = 'absolute';
		//
		mydiv.style.maxHeight = '66px';
		var str = '';
		for(var i = 0;i<20;i++){
			str+='hello,it\'s div <br />';
		}
		mydiv.innerHTML = str;
		document.body.appendChild(mydiv);

		var myb = document.createElement('b');
		myb.innerHTML = 'test b';
		document.body.appendChild(myb);
	}

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