Updates angular/hlsUtil.md

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angular/hlsUtil.md

@@ -50,4 +50,17 @@ function objToString(){
 ```
 
 ##### 5.判断数组中是否含有某个元素  `inArray`
+- 函数参数为对象
+- 返回字符串
+- 调用实例如下
+```javascript
+function objToString(){
+    var obj={
+      "apiKey":'123123SFgy',
+      "apiSecret":'QEZ!$XHFHFTV'
+    }
+    hlsUtil.objToString(obj);
+  }
+```
+