如何在setInterval内部clearInterval

问题:

我遇到了这样的问题:

let callBackFunction = function(timer){
            .........
            // when i want to clear the TimeInterval:       
          clearInterval(timer);       
};

let timer = setInterval(callBackFunction, 1000 ,timer);

这样会报错: timer变量提前被引用了

solution

实际上, 并不需要按照API中那样刻板的传递参数. 避免参数引用麻烦的解决办法就是在callBack Function中, 直接引用外围的变量, 就是timer, 如下:

let callBackFunction = function(){
            .........
            // when i want to clear the TimeInterval:       
          clearInterval(timer);       
};

let timer = setInterval(callBackFunction, 1000 );   / / Just don't pass that param