js 禁止冒泡点击页面空白处,隐藏特定的div

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<!doctype html><html>    <head>        <title>demo</title>        <style type="text/css">            .main { position:relative}            #btn { border:none;cursor:pointer;background:#ccc }            .layer { position:absolute;height:30px;width:50px;background:#4cff00;display:none }        </style>        <script>            window.onload = function () {                function stopPropagation(e) {                    if (e.stopPropagation) {                        e.stopPropagation();                    } else {                        e.cancelBubble = false;                    }                }                var btn = document.getElementById("btn");                var layer = document.getElementById("layer");                btn.onclick = function (e) {                                       layer.style.display = "block";                    layer.style.left = "10px";                    layer.style.top = "50px";                    stopPropagation(e);                                                     }                window.onclick = function (e) {                    layer.style.display = "none";                }            }        </script>    </head>    <body>        <div class="main">            <input  id="btn" type="button" value="点击"/>            <div class="layer" id="layer">            </div>        </div>    </body></html>

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js 禁止冒泡 点击页面空白处,隐藏特定的div

js 禁止冒泡点击页面空白处,隐藏特定的div