Correction status:qualified
Teacher's comments:
明星相册:
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>2.实战:明星相册</title> <style type="text/css"> .box { width: 500px; height: 700px; background-color: #efefef; border: 1px solid lightgray; margin: 20px auto; text-align: center; color: #636363; box-shadow: 2px 2px 2px #999; } .box ul { margin:0; padding:0; /*将ul转为BFC独立块,使之不受内部浮动元素的影响*/ overflow: hidden; } .box ul li { list-style-type: none; float:left; width: 100px; height: 40px; background-color: skyblue; margin-left: 20px; } .box ul li a { /*将a转为块元素,并设置为li的宽高,这样可以使整个li可以被点击*/ display: block; width: 100px; height: 40px; line-height: 40px; color: white; /*去掉a标签里的下划线*/ text-decoration: none; } .box ul li:hover { font-size:1.2em; background-color: coral; } .box .pic { width: 450px; height:450px; border: 1px solid lightgray; /*消除img标签底部的空间区*/ line-height: 1px; margin: auto; margin-top: 50px; } .box .pic img { width: 100%; height: 100%; } .box .pic img:hover { /*border-radius: 50%;*/ } </style> </head> <body> <!-- 知识点: 1.js代码可以写在哪里?2.js如何调用的? 3.js函数的使用语法--> <div class="box"> <h2>明星相册</h2> <ul> <!-- <li><a href="../images/zly.jpg" onclick="document.getElementById('img').src = this.href;return false">赵丽颖</a></li> --> <li> <a href="../images/zly.jpg" title="《楚乔传》,《花千骨》,《陆贞传奇》..." onclick="changePic(this);return false">赵丽颖</a> </li> <li> <a href="../images/gyy.jpg" title="《倚天屠龙记》,《咱们经婚吧》,《爱无悔》..." onclick="changePic(this);return false">高圆圆</a> </li> <li> <a href="../images/sl.jpg" title="《那年花开月正圆》,《甑环传》,《玉观音》..." onclick="changePic(this);return false">孙俪</a> </li> <li><a href="../images/fbb.jpg" title="《还珠格格》,《武媚娘传奇》,《我不是潘金莲》..." onclick="changePic(this);return false">范冰冰</a></li> </ul> <div class="pic"> <img src="../images/zwt.png" alt="" id="img"> </div> <p id='info'></p> </div> <script type="text/javascript"> function changePic(a) { //1.获取到要替换的明星图片与简介信息 var aUrl = a.href var aInfo = a.title var aName = a.innerHTML //2.获取到页面中,要被替换掉的图像元素对象 var img = document.getElementById('img') var p = document.getElementById('info') //3. 将对应的图像与信息占位符进行替换 img.src = aUrl p.innerHTML = '<span style="color:coral">'+aName+':'+aInfo+'</span>' } </script> </body> </html>
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计算器:
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>3.迷你计算器</title> <style type="text/css"> .box { width: 500px; height: 200px; background-color: #efefef; border: 1px solid lightgray; text-align: center; margin: auto; margin: 20px auto; color: #636363; border-radius: 15px; box-shadow: 2px 2px 2px #999; } table { margin: auto; /*border: 1px solid red;*/ } td { width: 100px; height: 30px; padding: 5px 10px; } input, select { width: 100%; height:100%; border:none; text-align: center; /*background-color: cyan;*/ } button { width: 100%; height: 100%; border: none; background-color: skyblue; color: white; } button:hover { cursor: pointer; background-color: coral; width: 105%; height: 105%; } </style> </head> <body> 知识点: <!-- 1.获取页面元素的方法; 2.条件判断语句的使用方法 3.事件方法函数的作用 --> <div class="box"> <h2>迷你计算器</h2> <form> <table> <tr> <td><input type="text" name="opt1" placeholder="操作数1"></td> <td> <select name="option"> <option value="null">请选择操作</option> <option value="add"> + </option> <option value="sub"> - </option> <option value="mul"> * </option> <option value="div"> / </option> </select> </td> <td><input type="text" name="opt2" placeholder="操作数2"></td> <td><button type="button">计算</button></td> </tr> <tr> <td colspan="2" align="right"><h3>结果:</h3></td> <td colspan="2" align="left"><h3 id="placeholder"></h3></td> </tr> </table> </form> </div> <script type="text/javascript"> //1.获取操作数,按钮与结果占位符 var opt1 = document.getElementsByName('opt1')[0] var opt2 = document.getElementsByName('opt2')[0] var opt = document.getElementsByName('option')[0] var btn = document.getElementsByTagName('button')[0] var placeholder = document.getElementById('placeholder') //2.给按钮添加事件,执行计算操作 btn.onclick = function(){ // var data1 = parseFloat(opt1.value) // var data2 = parseFloat(opt2.value) if (opt1.value.length == 0 ) { alert('第一个操作数不能为空') opt1.focus() return false } else if (isNaN(opt1.value)) { alert('第一个操作数必须为数字') opt1.focus() return false } else if (opt2.value.length == 0) { alert('第二个操作数不能为空') opt2.focus() return false } else if (isNaN(opt2.value)) { alert('第二个操作数必须为数字') opt2.focus() return false } else { var data1 = parseFloat(opt1.value) var data2 = parseFloat(opt2.value) } var option = opt.value var temp = 0 var flag = '' var result = '' switch (option){ case 'null': alert("请选择操作类型") opt.focus() return false case 'add': flag = '+' temp = data1 + data2 break case 'sub': flag = '-' temp = data1 - data2 break case 'mul': flag = '*' temp = data1 * data2 break case 'div': flag = '/' if (data2 == 0) { alert('除数不能为0,请重新输入') opt2.focus() return false } else { temp = data1 / data2 } break } // placeholder.innerHTML = '<span style="color:coral">'+data1+' '+ flag+' '+ data2+' = '+temp +'</span>' var str = '<span style="color:coral">' str += data1+' '+flag+' '+data2 + ' = ' + temp str += '</span>' placeholder.innerHTML = str } </script> </body> </html>
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