add 6.2 and 6.3

6.2RestSpread/t.js

@@ -0,0 +1,47 @@
+console.log("Rest and Spread Operator");
+
+console.log("Rest Operator");
+// Rest Operator
+
+function sumAll(...args){
+    let sum = 0;
+    for(let arg of args){
+        sum += arg;
+    }
+    return sum;
+}
+
+console.log(sumAll(1,2,3,4,5));
+
+function showName(firstName, lastName, ...titles) {
+    console.log( firstName + ' ' + lastName ); // Julius Caesar
+
+    // 剩余的参数被放入 titles 数组中
+    // i.e. titles = ["Consul", "Imperator"]
+    console.log( titles[0] ); // Consul
+    console.log( titles[1] ); // Imperator
+    console.log( titles.length ); // 2
+}
+
+showName("Julius", "Caesar", "Consul", "Imperator");
+
+console.log("Attention: Rest parameters should be at the end");
+console.log("Attention: Only one rest parameter is allowed");
+consoel.log("Attention: Arrow functions do not have 'arguments' object");
+
+console.log("Spread Operator");
+// Spread Operator
+let arr = [3, 5, 1];
+console.log(Math.max(arr)); // NaN
+console.log(Math.max(...arr)); // 5
+let arr1 = [1, -2, 3, 4];
+let arr2 = [8, 3, -8, 1];
+console.log(Math.max(...arr1, ...arr2)); // 8
+let merged = [0, ...arr1, 2, ...arr2];
+console.log(merged);
+
+console.log("Attention: Spread operator can be used to merge arrays");
+console.log("Attention: Spread operator can be used to convert string to array");
+console.log("Attention: Spread operator can be used to convert arguments to array");
+
+