arraybuffer: add trans for solution js

Author: bemself

Diff for: 4-binary/01-arraybuffer-binary-arrays/01-concat/_js.view/solution.js

@@ -1,13 +1,13 @@
 function concat(arrays) {
-  // sum of individual array lengths
+  // 单个数组长度求和
   let totalLength = arrays.reduce((acc, value) => acc + value.length, 0);
 
   if (!arrays.length) return null;
 
   let result = new Uint8Array(totalLength);
 
-  // for each array - copy it over result
-  // next array is copied right after the previous one
+  // 对于每个数组 - 复制到 result
+  // 下一个数组在前一个后面复制
   let length = 0;
   for(let array of arrays) {
     result.set(array, length);

Diff for: 4-binary/01-arraybuffer-binary-arrays/01-concat/_js.view/source.js

@@ -1,5 +1,5 @@
 function concat(arrays) {
-  // ...your code...
+  // ...您的代码...
 }
 
 let chunks = [