2020-3-10 learning map Jquery value on the span tag assigned usage-depth understanding of Java enumeration type (enum) IDEA import maven import solutions net.sf.json being given

Set value of the span tag →  https://www.baidu.com/s?wd=%E5%AF%B9span%E6%A0%87%E7%AD%BE%E8%AE%BE%E7%BD%AE % E5% 80% BC

Jquery span tag on the value assignment usage  →  https://www.cnblogs.com/seeusmile-cnblog/p/6211264.html

1  // Assignment 
2  
. 3 $ ( "# spanid" ) .html (value)
 . 4  
. 5  // value 
. 6  
. 7 $ ( "# spanid"). Text ()

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Lack javax.servlet.http.HttpServlet package, Tomcat server configured in the project can be a →  https://www.baidu.com/s?wd=javax.servlet.http.HttpServlet (Baidu search)

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→ red cross on the eclipse project  https://www.baidu.com/s?ie=utf-8&f=3&rsv_bp=1&tn=baidu&wd=eclipse%E9%A1%B9%E7%9B%AE%E4%B8%8A % E6% 9C% 89% E7 % BA% A2% E5% 8F% 89 & oq = eclipse & rsv_pq = c2d900cf0001039d & rsv_t = 553bxv7bwY8nPHY82ruyxHFs1zGi2C1bFjV2M% 2F% 2FfcAS0O01299ggDJHB9cU & rqlang = cn & rsv_enter = 1 & rsv_dl = ts_0 & rsv_sug3 = 15 & rsv_sug1 = 2 & rsv_sug7 = 100 & rsv_sug2 = 0 & prefixsug = eclipse% 25E9% 25A1% 25B9 % 25E7% 259B% 25AE% 25E4 % 25B8% 258A & rsp = 0 & inputT = 7254 & rsv_sug4 = 7381

Eclipse project name displays a red x →  https://jingyan.baidu.com/article/af9f5a2d7c196743140a4533.html

java enum class →   https://www.baidu.com/s?ie=utf-8&f=8&rsv_bp=1&tn=baidu&wd=java%20enum%E7%B1%BB&oq=java%2520enum%25E7%2594%25A8%25E6% 25 b 3% 2595 & rsv_pq = f544936400009c01 & rsv_t = f637DIYmkqDWL1lKVksICd6x8fppKK4f4WYGYws8p5Old62A83AULVRAFfc & rqlang = CN & rsv_enter =. 1 & rsv_dl = TB & inputT = 980 & rsv_sug3 = 14 & rsv_sug1 =. 7 & rsv_sug7 = 100 & rsv_sug2 = 0 & rsv_sug4 = 2156 & rsv_sug = 2 (Baidu search)

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Depth understanding of Java enumeration type (enum)  →  https://www.cnblogs.com/alter888/p/9163612.html

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Package net.sf.json → absence springboot packing  https://www.baidu.com/s?wd=springboot%E6%89%93%E5%8C%85%E6%97%B6%E7%A8 % 8B% E5% BA% 8F % E5% 8C% 85net.sf.json% E4% B8% 8D% E5% AD% 98% E5% 9C% A8

IDEA introducing solution is introduced into the maven given net.sf.json  →  https://www.cnblogs.com/keaihaizi/p/10834602.html

introducing maven item net.sf.json packet error, solutions →  https://blog.csdn.net/u012655663/article/details/79678822

Adding Pom.xml in:

1 <!-- JSON -->
2 <dependency>
3     <groupId>net.sf.json-lib</groupId>
4     <artifactId>json-lib</artifactId>
5     <version>2.4</version>
6     <classifier>jdk15</classifier>
7 </dependency>

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