my code is as follows:
var downH = document.querySelector(".down");
var anmin = 0;
function anminDown() {
if (anmin < downH.offsetHeight) {
anminPP;
downH.setAttribute("style", "bottom:" + -anmin + "px");
} else {
clearInterval(timer);
}
};
var timer = setInterval(anminDown, 50);
// document.querySelector(".meun").addEventListener("onmouseenter", function () {
// anminDown;
// });Why does the timer run automatically? There is no place in the code to call it
executes to var timer = setInterval (anminDown, 50); does these things:
1, declare a variable timer with the value undefined
2, call the setInterval method, notify the runtime, execute anminDown
3 at 50 millisecond intervals, assign the return value of setInterval to timer
obviously, your code has told the browser to execute anminDown ;
solution, add a start function, call when you need to start:
var cancelToken = null;
......
function start() {
cancelToken = setInterval(anminDown, 50);
}
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