取消冒泡

w3c取消冒泡
e.stopPropagation();
IE取消冒泡
e.cancelBubble();
实例：
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>取消冒泡</title>
</head>
<body>
<div id="box1" style="background: #ABCDEF;  300px;height: 300px;">
    <input type="button" value="test1" id="btn1">
</div>
<script>
    var btn1 = document.getElementById("btn1");
    var box1 = document.getElementById("box1");
    btn1.onclick = function (e) {
        alert("button clicked");
        var e = e||window.event;//兼容ie
        if(typeof e.cancelBubble == "undefined"){
            e.stopPropagation();
        }else {
            e.cancelBubble = true;
        }
    };
    box1.onclick = function () {
        alert("div clicked")
    };
    document.body.onclick = function () {
        alert("body clicked")
    };
    document.documentElement.onclick = function () {
        alert("html clicked")
    };
    document.onclick = function () {
        alert("document clicked")
    }
</script>
</body>
</html>