var id = setInterval(fn, delay); - Similar to setTimeout but continually calls the function (with a delay every time) until it is canceled.

varid =setInterval(fndelay);- 与setTimeout类似，只不过它会持续地调用指定的函数（每次都有一个延时），直到timer被取消为止。

youdao

var id = setInterval(fn, delay); - Similar to setTimeout but continually calls the function (with a delay every time) until it is canceled.

varid =setInterval(fndelay);- 与setTimeout类似，只不过它会持续地调用指定的函数（每次都有一个延时），直到timer被取消为止。

youdao