JavaScript--開關思想

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就是男默女淚的立flag!

 

 1 <!DOCTYPE html> 2 <html lang="en"> 3 <head> 4     <meta charset="UTF-8"> 5     <title>Title</title> 6     <style> 7         .video-box{ 8             width: 1000px; 9             height: 500px;10             background-color: skyblue;11             margin: 50px auto;12         }13         body.night{14             background-color: #333;15             color: #fff ;16         }17         body.night button{18             background-color: #ccc;19             color:#fff;20         }21 22     </style>23     <script>24         window.onload = function () {25             var btn = document.getElementsByTagName(‘button‘);26             var flag = false;27             btn[0].onclick = function () {28                 if(!flag) {29                     document.body.className = "night";30                     btn[0].innerHTML = "開燈";31                 }else {32                     document.body.className = "";33                     btn[0].innerHTML = "關燈";34                 }35                 flag = !flag;36             }37 38 //            var flag = true;39 //            btn[0].onclick = function () {40 //                flag = !flag;41 //                if(!flag) {42 //                    document.body.className = "night";43 //                    btn[0].innerHTML = "開燈";44 //                }else {45 //                    document.body.className = "";46 //                    btn[0].innerHTML = "關燈";47 //                }48 //49 //            }50         }51     </script>52 </head>53 <body>54 <button>關燈</button>55 <h2>頁面的文字</h2>56 <div class="video-box"></div>57 </body>58 </html>

 

JavaScript--開關思想

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