[英]Run function only once. && doesn't work in IE
This function should only be able to run once, which works in Chrome and FF -- BUT In IE you can run it multiple times.这个函数应该只能运行一次,它在 Chrome 和 FF 中有效——但在 IE 中你可以多次运行它。 How can I make it able to run only once in IE ?
我怎样才能让它在 IE 中只能运行一次?
function topSect() {
var mouseY = 0;
var topValue = 10;
var executed = false;
window.addEventListener("mouseout", function(e) {
mouseY = e.clientY;
if (mouseY < topValue && !executed) {
//do something here
executed = true;
}
},
false);
};
Use removeEventListener to ensure that the mouseleave is ever triggered only once.使用removeEventListener确保 mouseleave 只触发一次。
var mouseY = 0; var topValue = 10; var executed = false; function mouseoutHandler(e){ window.removeEventListener("mouseout", mouseoutHandler, false); mouseY = e.clientY; exectued = true; console.log(mouseY); } function topSect() { window.addEventListener("mouseout", mouseoutHandler, false); }; topSect();
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