//直接操作需要的元素
var container = document.getElementById('container');
container.style.height = (container.scrollHeight > 199) ? "200px" : "auto";

//定义函数，多次调用
function setMaxHeight(elementId, height){
	var container = document.getElementById(elementId);
	container.style.height = (container.scrollHeight > (height - 1)) ? height + "px" : "auto";
}
//调用函数
setMaxHeight('container1', 200);
setMaxHeight('container2', 500);
//javascript/5130