在js里加入事件 点击 移动等

var aa = document.getElementById('aa')
	var bb = document.querySelector('#bb')
	var cc = document.getElementById('cc')
	//给aa挂上事件 onclick
	aa.onclick = function(){
	cc.style.width = '300px'
	cc.style.height = '300px'
	cc.style.backgroundColor = 'red'
	}
	bb.onclick = function(){
	cc.style.width = '200px'
	cc.style.height = '200px'
	cc.style.backgroundColor = 'blue'
	}