add(server.tests.test2): 添加实验2的内容，将pdf里面标重要的进行提取出来

Server/tests/test2/important/slice.js

@@ -0,0 +1,14 @@
+// let rst = array.slice([start[, end]]);
+
+const animals = ["ant", "bison", "camel", "duck", "elephant"];
+
+console.log(animals.slice(2))
+console.log(animals.slice(-2))
+console.log(animals.slice(2, 4))
+
+/*
+# node slice.js 
+[ 'camel', 'duck', 'elephant' ]
+[ 'duck', 'elephant' ]
+[ 'camel', 'duck' ]
+*/