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                ## 6.4 JavaScript使用案例 ### 6.4.1 JavaScript邏輯判斷語法案例 #### 例子1: //判斷字符串長度: ~~~javaScript var name = "西門吹雪"; document.write(name.length); ~~~ //判斷是否包含字符串: ``` var name = "西門吹雪"; if(name.indexOf("西門") > -1){ document.write("包含西門"); }else{ document.write("不包含西門"); } ``` #### 例子2: ``` var age = 18 if(age < 18){ document.write("你還未成年,不能觀看"); }else{ document.write("歡迎觀看"); } ``` #### 例子3: ```js var age = 18; if (age > 0 && age <= 6) { document.write("你還是一個孩子"); } else if (age > 6 && age <= 17) { document.write("你是一個少年"); } else if (age > 17 && age <= 40) { document.write("你是一個青年"); } else if (age > 40 && age <= 65) { document.write("你是一個中年"); } else { document.write("你已步入老年"); } ``` #### 例子4: ``` var age = 19; if(age < 6 || age > 18){ document.write("你不是一個少年"); }else{ document.write("你是一個少年"); } ``` #### 例子5: ``` var name = "張三"; if(name!= "張三"){ document.write("你不是張三"); }else{ document.write("你是張三"); } var name = "張三"; if(!(name == "張三")){ document.write("你不是張三"); }else{ document.write("你是張三"); } ``` #### 例子6: ``` var age = 17; if((age > 0 && age < 18) || (age > 65)){ document.write("歡迎光臨你可以免費游園"); }else{ document.write("請先購票"); } ``` #### 例子7: ``` var age = 18; var man = age>=18?"你已經成年":"你還未成年"; document.write(man); ``` #### 例子8: ``` var name = "劉德華"; switch(name) { case "劉德華": document.write("這個人長的超帥的!"); break; case "梁朝偉": document.write("這個人有一雙迷人的眼睛!"); break; case "吳彥祖": document.write("超級大帥鍋"); break; case "楊洋": document.write("小鮮肉"); break; default: document.write("此人未被列入帥哥名單"); } ``` #### 例子9: 循環遍歷數組 ``` var nameList=["張三","李四","王五","趙六"]; for (var i in nameList) { document.write(nameList[i] + "<br>"); } ``` #### 例子10: 判斷王五是否存在 ``` var name = "王五"; var nameList = ["張三", "李四", "王五", "趙六"]; var flag = false; for (var i in nameList) { if (nameList[i] == name) { flag = true; break; } } if (flag) { document.write("這群人中包含王五"); } else { document.write("這群人中不包含王五"); } ``` ### 6.4.2 ruyi.ai模版輸入參數與輸出參數使用案例 **ruyi.ai模板輸入參數in案例** 在線調試案例對應的JS ``` sys.template.javascript.v2= var name=sys.in.name; var age=sys.in.age; var result = ""; if(age < 18){ result = name + " 你還未成年,不能觀看"; }else{ result = name + "歡迎觀看"; } return result; ``` **ruyi.ai模板輸出參數out案例** 輸出參數out使用模版 ``` sys.template.javascript.v2= var code =sys.out.result; return code; ``` **說明** ``` 'sys '做為系統變量 ,請慎用。 ``` 天氣查詢輸出參數out真實案例 + ①天氣查詢接口的輸出json為: ![](https://box.kancloud.cn/8e9fc08e9920946d7832398fd965be84_472x715.jpg) + ②當用戶問“今天天氣怎樣?”時,我們想讓機器人做出如下回答: ![](https://box.kancloud.cn/689060c59f03d2418b49e8e8255b7b32_348x406.jpg) 使用到的接口out的值如圖所示: ![](https://box.kancloud.cn/9e78916afe813ed6736ce84615f98dfc_503x722.jpg) + ③這條JS應當編寫如下 ``` sys.template.javascript.v2= var max = sys.out.day_weather.tmp.max; var min = sys.out.day_weather.tmp.min; var qlty = sys.out.aqi.city.qlty; var result = ""; if (date != 'null') { if (max != 'null' && min != 'null') { result = '溫差是' + (max - min); } if (qlty != 'null') { result = result + '<br/>空氣質量' + qlty; } } return result; ```
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