1,常见气体的制取和检验 ⑴氧气 制取原理——含氧化合物自身分解 制取方程式——2KClO3 2KCl+3O2↑ 装置——略微向下倾斜的大试管,加热 检验——带火星木条,复燃 收集——排水法或向上排气法 ⑵氢气 制取原理——活泼金属与弱氧化性酸的置换 制取方程式——Zn+H2SO4 === H2SO4+H2↑ 装置——启普发生器 检验——点燃,淡蓝色火焰,在容器壁上有水珠 收集——排水法或向下排气法
' </a> </p> </div> </div> <input type="hidden" id="commentViewpoint" value="1" /> <input type="hidden" id="commentIsPrivate" value="0" /> <input type="hidden" id="commentIsAnonymous" value="false" /> <input type="hidden" id="commentRanking" value="3" /> <script language="javascript" type="text/javascript"> function $getE(obj) { return document.getElementById(obj); } //初始化评论 function commentInit() { var x = new AjaxRequest('XML', 'commentForm'); x.labelname = "内容评论标签"; x.para = ['itemId=229','nodeId=41']; x.currentpage = 1; x.post('updatelabel', '/ajax.aspx', function(s) { var xml = x.createXmlDom(s); $getE('commentform').innerHTML = xml.getElementsByTagName("body")[0].firstChild.data; changepage(1, '评论列表', 'JS_基本风格'); setCurrentUserInfo(); }); } //添加评论 function addComment() { if ($getE('commentTitle').value == '') { alert("请输入标题！"); $getE("commentTitle").focus(); return; } if ($getE('commentIsAnonymous').value == 'false') { if ($getE('commentUsername').value == '') { alert("请输入用户名！"); $getE('commentUsername').focus(); return; } if ($getE('commentEmail').value == '') { alert('请输入Email地址！'); $getE('commentEmail').focus(); return; } var regEmail = /^([a-zA-Z0-9]+[_|\-|\.]?)*[a-zA-Z0-9]+@([a-zA-Z0-9]+[_|\-|\.]?)*[a-zA-Z0-9]+\.[a-zA-Z]{2,3}$/; if ($getE('commentEmail').value.match(regEmail) == null) { alert('请输入正确的Email格式！'); $getE('commentEmail').focus(); return; } } if ($getE("commentContnet").value == '') { alert("请输入评论内容！"); $getE("commentContnet").focus(); return false; } var commentValidCode = ""; var checkValidCode = false; if ($getE("commentValidCode") != null) { if ($getE("commentValidCode").value == '') { alert("请输入验证码！"); $getE("commentValidCode").focus(); return; } commentValidCode = $getE("commentValidCode").value; checkValidCode = true; } var x = new AjaxRequest('XML', 'status'); x.para = ['username=' + $getE("commentUsername").value, 'commenttitle=' + $getE("commentTitle").value, 'content=' + $getE("commentContnet").value, 'email=' + $getE("commentEmail").value, 'gid=229', 'nid=' + 41, 'private=' + $getE("commentIsPrivate").value, 'position=' + $getE("commentViewpoint").value, 'score=' + $getE("commentRanking").value, 'TxtValidCode=' + commentValidCode, 'isguest=' + $getE("commentIsAnonymous").value]; x.paratype = ['nohtml', 'nohtml', 'nohtml'] x.post('addcomment', '/ajax.aspx', function(s) { var xml = x.createXmlDom(s); var status = xml.getElementsByTagName("status")[0].firstChild.data; switch (status) { case "ok": changepage(1, '评论列表', 'JS_基本风格'); alert("发表评论成功！"); window.location.href = '#commentTarget'; $getE("commentContnet").value = ''; break; case "check": alert("发表评论成功，请等待管理员审核。"); break; case "err": alert("发表评论失败！"); break; case "nopurview": alert("此栏目已禁止发表评论！"); break; case "noTourists": alert("此栏目已禁止游客发表评论！"); break; case "checkCodeError": $getE("commentValidCode").value = ''; refreshValidCode($getE("commentValidCodeImg")); alert("您输入的验证码和系统产生的不一致，请重新输入！"); break; default: alert("发表评论失败！"); break; } if (checkValidCode) { refreshValidCode($getE("commentValidCodeImg")); $getE("commentValidCode").value = ''; checkValidCode = false; } }); } function addPkZone(commentid, position, content) { var x = new AjaxRequest('XML', 'status'); x.para = ['commentid=' + commentid, 'position=' + position, 'content=' + content]; x.post('addpkzone', '/ajax.aspx', function(s) { var xml = x.createXmlDom(s); var status = xml.getElementsByTagName("status")[0].firstChild.data; switch (status) { case "ok": changepage(1, '评论列表', 'JS_基本风格'); break; default: alert("辩论失败！"); break; } }); } //更新列表 function changepage(pagenum, sourcename, spanname) { var x = new AjaxRequest('XML', 'pe100_' + sourcename); x.labelname = sourcename; x.currentpage = pagenum; x.para = ['itemId=229', 'outputQty=10', 'page=true', 'pagesize=10', 'currentpage=' + pagenum]; x.post('updatelabel', '/ajax.aspx', function(s) { var xml = x.createXmlDom(s); var plstr = ""; for (var i = 0; i < xml.getElementsByTagName("body")[0].childNodes.length; i++) { plstr += xml.getElementsByTagName("body")[0].childNodes[i].nodeValue; } $getE('pe100_' + sourcename).innerHTML = plstr; $getE('commentCount').innerHTML = xml.getElementsByTagName("total")[0].firstChild.data; updatepage(spanname, sourcename, xml); }); } //更新分页 function updatepage(spanname, sourcename, xml) { if (parseInt(xml.getElementsByTagName("total")[0].firstChild.data) > 0) { var x = new AjaxRequest('XML', 'pe100_page_' + sourcename); x.labelname = spanname; x.sourcename = sourcename; x.total = xml.getElementsByTagName("total")[0].firstChild.data; x.currentpage = xml.getElementsByTagName("currentpage")[0].firstChild.data; x.pagesize = xml.getElementsByTagName("pagesize")[0].firstChild.data; x.post('updatepage', '/ajax.aspx', function(s) { var xml = x.createXmlDom(s); if ($getE('pe100_page_' + sourcename) != null) { var plstr = ""; for (var i = 0; i < xml.getElementsByTagName("body")[0].childNodes.length; i++) { plstr += xml.getElementsByTagName("body")[0].childNodes[i].nodeValue; } $getE('pe100_page_' + sourcename).innerHTML = plstr; } }); } } //设置默用户信息 function setCurrentUserInfo() { try { var x = new AjaxRequest('XML', ''); x.post('logincheck', '/ajax.aspx', function(s) { var xml = x.createXmlDom(s); if (xml.getElementsByTagName("status")[0].firstChild.data == "ok") { if ($getE('commentUsername') != null) { $getE('commentUsername').value = xml.getElementsByTagName("username")[0].firstChild.data; $getE('commentEmail').value = xml.getElementsByTagName("email")[0].firstChild.data; $getE('commentUsername').disabled = true; $getE('commentEmail').disabled = true; } } }); } catch (e) { } } //刷新验证码 function refreshValidCode(obj) { obj.src = obj.src + '?code=' + randomNumber(10); } function randomNumber(n) { var rnd = ''; for (var i = 0; i < n; i++) rnd += Math.floor(Math.random() * 10); return rnd; } //设置匿名 function setAnonymous(obj) { if (obj.checked) { $getE('commentUsernameBlock').style.display = 'none'; $getE('commentEmailBlock').style.display = 'none'; $getE('commentIsAnonymous').value = 'true'; } else { $getE('commentUsernameBlock').style.display = ''; $getE('commentEmailBlock').style.display = ''; $getE('commentIsAnonymous').value = 'false'; } } //设置私有 function setPrivate(obj) { if (obj.checked) { $getE('commentIsPrivate').value = 1; } else { $getE('commentIsPrivate').value = 0; } } //设置观点 function setViewpoint(value) { for (i = -1; i < 2; i++) { if (i == value) { $getE('commentViewpointTab' + i).className = "current"; } else { $getE('commentViewpointTab' + i).className = ""; } } $getE('commentViewpoint').value = value; } //设置按钮 function changeBtnStyle(obj, className) { obj.className = className; } //设置评分 function changeRanking(index, isfixed) { var colStars = $getE("commentRankingBlock").getElementsByTagName("input"); var k = isfixed ? parseInt($getE("commentRanking").value) : index; for (var i = 0; i < colStars.length; i++) { colStars[i].src = (i < k ? "/Images/fstar.gif" : "/Images/estar.gif"); } } function rankingClick(index) { $getE("commentRanking").value = index; } function rankingMouseOver(index) { changeRanking(index, false); } function rankingMouseOut() { changeRanking(0, true); } //初始化评论 commentInit(); </script> </body> </html>
