(2)自动重复:可以使用 repeat 方法来使同一个字符串输出多次(被连续复制多次): const sourceCode = 'repeat for 3 times;' const repeated = sourceCode.repeat(3) console.log(repeated) // repeat for 3 times;repeat for 3 times;repeat for 3 times; 1. 2. 3. JavaScript有哪些内置对象 全局的对象(...