<!--计算器-->请输入数字1： <input type="text" id="n1"><br>请输入数字2： <input type="text" id="n2"><br>请选择运算符： <select name="" id="fh"> <option value="+">+</option> <option value="-">-</option> <option value="*">*</option> <option value="/">/</option></select><br><button id="btn1" onClick="a()">计算</button>结果为： <span id="jg1"></span><script> function a(){ var n1 = +document.getElementById("n1").value; var n2 = +document.getElementById("n2").value; var fh = document.getElementById("fh").value; var btn1 = document.getElementById("btn1"); var str = ""; switch(fh){ case "+": str = n1 + n2; break; case "-": str = n1 - n2; break; case "*": str = n1 * n2; break; case "/": str = n1 / n2; break; } document.getElementById("jg1").innerHTML = str; }</script><!--动态时钟--><div id="st"></div><script> function getDate(){ var date = new Date(); var date1 = date.toLocaleString(); var div1 = document.getElementById("st"); div1.innerHTML = date1; } setInterval("getDate()",1000);</script><!--全选全不选--><table width="300" border="1"> <tr> <th> <input type="checkbox" id="qx" onClick="qx()">全选 </th> <th>姓名</th> <th>性别</th> <th>年龄</th> </tr> <tr> <td> <input type="checkbox" class="xz"> </td> <td>默默</td> <td>女</td> <td>20</td> </tr> <tr> <td> <input type="checkbox" class="xz"> </td> <td>笨笨</td> <td>女</td> <td>20</td> </tr> <tr> <td> <input type="checkbox" class="xz"> </td> <td>娜娜</td> <td>女</td> <td>20</td> </tr></table><script> function qx(){ var qx = document.getElementById("qx"); var zhi = qx.checked; var xz = document.getElementsByClassName("xz"); for(var i = 0;i < xz.length;i++){ xz[i].checked = zhi; } }</script><!--轮播图--><button onClick="sy()" id="syz">上一张</button><img src="imgs/300 (1).jpg" id="tp"><button onClick="xy()" id="xyz">下一张</button><script> var syz = null; var xyz = null; var tp = null; var imgs = []; var n = null; var tm = null; window.onload = function(){ syz = document.getElementById("syz"); xyz = document.getElementById("xyz"); tp = document.getElementById("tp"); imgs = ["imgs/300 (1).jpg","imgs/300 (2).jpg","imgs/300 (3).jpg","imgs/300 (4).jpg","imgs/300 (5).jpg"]; n = 0; tm = setInterval(xy,3000); tp.onmouseover = function(){ clearInterval(tm); } tp.onmouseout = function(){ tm = setInterval(xy,3000); } } function sy(){ n--; if(n < 0){ n = imgs.length - 1; } for(var i = 0;i < imgs.length;i++){ tp.setAttribute("src",imgs[n]); } } function xy(){ n++; if(n > imgs.length - 1){ n = 0; } for(var i = 0;i < imgs.length;i++){ tp.setAttribute("src",imgs[n]); } }</script><!--36选7--><div id="szs"></div><button onClick="ks()">开始</button><span id="sjjg"></span><script> function xxx(){ var str = ""; for(var i = 1;i < 37;i++){ str += i + ‘,‘; } document.getElementById("szs").innerHTML = str; } xxx(); function ks(){ var stt = ""; for(i = 0;i < 7;i++){ var zhi = parseInt(Math.random()*36)+1; if(stt.indexOf(zhi) == -1){ stt += zhi + ","; }else{ i--; } } document.getElementById("sjjg").innerHTML = stt; } </script><!--验证码--><br>验证码： <span id="mmm"></span><br>请输入验证码： <input type="text" id="srrr"> <br><button onClick="yy()">验证</button><span id="nnn"></span><script> function ll(){ var zfs = "123456asdfgh"; zfs = zfs.split(""); var str = ""; for(var i = 0;i < 4;i++){ var zhi = parseInt(Math.random()*zfs.length); str += zfs[zhi]; } document.getElementById("mmm").innerHTML = str; } ll(); function yy(){ var yzm = document.getElementById("mmm").innerHTML; var srr = document.getElementById("srrr").value; if(yzm == srr){ document.getElementById("nnn").innerHTML = "输入正确"; }else{ document.getElementById("nnn").innerHTML = "输入错误"; } } </script><!--表格添加删除--><table width="300" border="1" id="tab"> <tr> <th onClick="change(this)">年级</th> <th onClick="change(this)">姓名</th> <th onClick="change(this)">性别</th> <th onClick="change(this)">操作</th> </tr> <tr> <td onClick="change(this)">1</td> <td onClick="change(this)">找找</td> <td onClick="change(this)">女</td> <td> <button onClick="del(this)" class="scc">删除</button> </td> </tr> <tr> <td onClick="change(this)">2</td> <td onClick="change(this)">等等</td> <td onClick="change(this)">女</td> <td> <button onClick="del(this)" class="scc">删除</button> </td> </tr> <tr> <td onClick="change(this)">3</td> <td onClick="change(this)">肉肉</td> <td onClick="change(this)">女</td> <td> <button onClick="del(this)" class="scc">删除</button> </td> </tr></table><button onClick="add()" id="cre">添加</button><script> function add(){ var tab = document.getElementById("tab"); tab.innerHTML += `<tr> <td onClick="change(this)">4</td> <td onClick="change(this)">星星</td> <td onClick="change(this)">女</td> <td> <button onClick="del(this)" class="scc">删除</button> </td> </tr>` } function del(obj){ obj.parentElement.parentElement.remove(); }</script>