为什么我在这里得到“setTimeout 不是函数”？

Question

I am making a simple memory game. I used some setTimeout. Until a point, It was going good. After that I wanted to add a stopwatch. And bom. I got this error.

Uncaught TypeError: Property 'setTimeout' of object [object Object] is not a function

At this line:

function counter(){

ctxCounter.font="100pt Arial";
var fillT= setTimeout( function(){ctxCounter.fillText("3",270,340);} , 100);
var clearT= setTimeout( function(){counterClear();} , 1000);  
}

and my stopWatch part's code. After adding this line I get the error written above. But without stopwatch everything works perfectly.

var timer=0;
var running=false;
    

    function startPause(){
        if(running==false){
            running=true;
            increment();
        }
        else running=false;             
    }

    function reset(){
        timer=0;
        running=false;
    }


    function increment(){
        if(running==true){
            
            window.setTimeout=(

                function(){
                var mins= Math.floor(timer/600);
                var secs= Math.floor(timer/10);
                var tenths= timer%1000;
                var all= mins+":"+secs+":"+tenths;
                console.log(all);
                increment();
                },100);
        }

    }

I've stuck here for two days. Please, helm me.

Answer 1

问题在于这行代码：

window.setTimeout=( ... );

Answer 2

You have a bug at the increment function, there was a = after window.setTimeout

function increment(){
    if(running==true){

        window.setTimeout(

            function(){
            var mins= Math.floor(timer/600);
            var secs= Math.floor(timer/10);
            var tenths= timer%1000;
            var all= mins+":"+secs+":"+tenths;
            console.log(all);
            increment();
            },100);
    }

}

Answer 3

setTimeout is normally a function, not a variable. You're reassigning it to the value 100 in your statement;

window.setTimeout=(function(){...}, 100);

Next time you try to call it, it's not a function anymore.