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01.<div id="id1" style="width:200px; height:200px; position:absolute; top:100px; left:100px; background-color:blue; z-index:4">
02. <div id="id2" style="width:200px; height:200px; position:absolute; top:20px; left:70px; background-color:green; z-index:1"></div>
03. </div>
addEventListener中的第三个参 数是useCapture, 一个bool类型。当为false时为冒泡获取(由里向外)，true为capture方式(由外向里)。
eg1：
01.document.getElementById('id1').addEventListener('click', function() { console.log('id1');}, false);
02.
03.document.getElementById('id2').addEventListener('click', function() { console.log('id2');}, false);
点击id2的div结果是: id2， id1
01.document.getElementById('id1').addEventListener('click', function() { console.log('id1');}, false);
02.
03.document.getElementById('id2').addEventListener('click', function() { console.log('id2');}, true);
结果是: id2, id1
01.document.getElementById('id1').addEventListener('click', function() { console.log('id1');}, true);
02.
03.document.getElementById('id2').addEventListener('click', function() { console.log('id2');}, false);
结果是：id1，id2
01.document.getElementById('id1').addEventListener('click', function() { console.log('id1');}, true);
02.
03.document.getElementById('id2').addEventListener('click', function() { console.log('id2');}, true);
结果是：id1，id2
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