Merge pull request #1278 from xiaofei-2020/dp12

添加（背包理论基础01背包-2.md）：增加typescript版本

problems/背包理论基础01背包-2.md

@@ -315,6 +315,30 @@ function test () {
 test();
 ```
 
+### TypeScript
+
+```typescript
+function testWeightBagProblem(
+  weight: number[],
+  value: number[],
+  size: number
+): number {
+  const goodsNum: number = weight.length;
+  const dp: number[] = new Array(size + 1).fill(0);
+  for (let i = 0; i < goodsNum; i++) {
+    for (let j = size; j >= weight[i]; j--) {
+      dp[j] = Math.max(dp[j], dp[j - weight[i]] + value[i]);
+    }
+  }
+  return dp[size];
+}
+const weight = [1, 3, 4];
+const value = [15, 20, 30];
+const size = 4;
+console.log(testWeightBagProblem(weight, value, size));
+
+```
+
 
 
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