试了两种方法,都不行,求大神指教
// 方法一
let listenOnce = (node, type, listener, useCapture=false) => {
let wrapper = (event) => {
console.log('wrapper called')
node.removeEventListener(type, wrapper, useCapture);
console.log('removed')
return listener(event);
}
node.addEventListener(type, wrapper, useCapture);
}
listenOnce(document, 'click', foobar);
// 方法二
let listenerWithTimes = (times, listener) => {
let count = times;
return (event) => {
if (count > 0) {
console.log(count);
listener(event);
}
count -= 1;
}
}
document.addEventListener('click', listenerWithTimes(1, foobar));
你确定不行吗?我想应该是其它错误了。请用chrome测试下面代码,我这里完全正确:
<script>
let listenOnce = (node, type, listener, useCapture=false) => {
let wrapper = (event) => {
console.log('wrapper called')
node.removeEventListener(type, wrapper, useCapture);
console.log('removed')
return listener(event);
}
node.addEventListener(type, wrapper, useCapture);
}
listenOnce(document, 'click', function(){
console.log('listener');
});
</script>