js 弹出新页面，避免被浏览器、ad拦截的一种办法

<input type="search" id="keyword" value="" autocomplete="off" placeholder="请输入搜索关键字" />
        <a href="###" id="submit" target="_blank" >搜索</a>
        <script type="text/javascript">
                (function(document) {
                    var submit = document.getElementById(‘submit‘);
                    var keyword = document.getElementById(‘keyword‘);
                    var url = ‘http://www.baidu.com/baidu?wd=‘;
                    submit.onfocus = submit.onmousedown = function() {
                        var href = url + escape(keyword.value);
                        if (href !== submit.href) {
                            submit.href = url + escape(keyword.value)
                        }
                    } 

                })(document);
        </script>