计算对eval的调用

// 动态地执行一段 JavaScript 代码
const code = 'const a = 1; console.log(a);';
eval(code);

const a = 10;
const b = 20;
const result = eval('a + b'); // result 等于 30

const command = 'console.log("Hello, World!");';
eval(command); // 输出 "Hello, World!"

const a = 10;
const b = 20;
const code = 'const result = a + b; console.log(result);';
eval(code); // 输出 30