setInterval(shrink(p),100);

这不是你想的那样。它调用了收缩函数，将p传递给它，然后将结果传递给setInterval。Shrink (p)返回undefined，所以这一行实际上没有在interval上放任何东西。

你可能想:

setInterval(function(){
    shrink(p)
}, 100);

您的代码有一些问题。

首先，在你的定义中:

var shrink = function(p) {
    for (var i = 0; i < 100; i++) {
        p.radius -= 1;
    }

    function asplode(p) {
         setInterval(shrink(p),100);
        balls.splice(p, 1);
    }
}

Asplode是收缩内作用域的本地，因此不能被更新中试图调用它的代码访问。JavaScript作用域是基于函数的，所以更新不能看到asplode，因为它不在收缩中。(在你的控制台中，你会看到这样的错误:Uncaught ReferenceError: asplode is not defined)

你可以先试着离开心理医生:

var shrink = function(p) {
    for (var i = 0; i < 100; i++) {
        p.radius -= 1;
    }
}

function asplode(p) {
     setInterval(shrink(p),100);
     balls.splice(p, 1);
}

然而，你的代码有几个问题超出了这个问题的范围:

setInterval expects a function. setInterval(shrink(p), 100) causes setInterval to get the return value of immediate-invoked shrink(p). You probably want setInterval(function() { shrink(p) }, 100) Your code for (var i = 0; i < 100; i++) { p.radius -= 1; } probably does not do what you think it does. This will immediately run the decrement operation 100 times, and then visually show the result. If you want to re-render the ball at each new size, you will need to perform each individual decrement inside a separate timing callback (like a setInterval operation). .splice expects a numeric index, not an object. You can get the numeric index of an object with indexOf: balls.splice(balls.indexOf(p), 1); By the time your interval runs for the first time, the balls.splice statement has already happened (it happened about 100ms ago, to be exact). I assume that's not what you want. Instead, you should have a decrementing function that gets repeatedly called by setInterval and finally performs balls.splice(p,1) after p.radius == 0.