要去掉字符串头尾的双引号,可以使用JavaScript的`trim()`方法。示例如下:
```javascript
let str = '"Hello, World!"';
let result = str.trim();
console.log(result); // 输出:Hello, World!
```
```javascript
let str = '"Hello, World!"';
let result = str.trim();
console.log(result); // 输出:Hello, World!
```