const infiniteIterable = {
    [Symbol.iterator]() {
        const thisRef = this
        return {
            value: true, // or any other value
            next() {
                return thisRef[Symbol.iterator]()
            }
        }
    }
}
for (let _ of infiniteIterable) {
    // ...
}

while (true) {

}

for (;;) {

}

while (true) {}

for (let i = 0; i > 0; i++) {}

// 这个等价于 while
for (;;) {}

let i = 0;
do {
  i++;
} while (i > 0);

// 不设置结束条件
function fn(a) {
  console.log(a);
  fn(a);
}