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防抖函数的this修正方式不正确
原文写法:
function debounce(fn, delay) {
//记录上一次的延时器
var timer = null;
return function () {
//清除上一次的演示器
clearTimeout(timer);
//重新设置新的延时器
timer = setTimeout(function(){
//修正this指向问题,!!setTimeout在这里改变了this的指向,指向了window!
fn.apply(this);
}, delay);
}
}
正确写法:
function debounce(fn, delay) {
//记录上一次的延时器
var timer = null;
return function () {
//清除上一次的演示器
clearTimeout(timer);
// 保存执行上下文的this对象,例如:事件触发对象
var that = this;
//重新设置新的延时器,使用箭头函数可能更好
timer = setTimeout(function(){
fn.apply(that);
}, delay);
}
}
整理到了语雀文档
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