SOURCE

// function debounce(fn, wait = 2000, immediate) {
//     let timer;

//     return function () {
//         if (immediate) {
//             return fn.apply(this, arguments)
//         }
//         if (timer) { clearTimeout(timer) }
//         timer = setTimeout(() => {
//             fn.apply(this, arguments)
//         }, wait)
//     }
// }




// // window.addEventListener('resize', () => {
// //     console.log('正常触发')
// // })

// // window.addEventListener('resize', debounce(() => {
// //     console.log('延迟触发')
// // }))


// function throttle(fn, wait = 2000) {
//     let prev = new Date()
//     return function () {
//         const args = arguments;
//         let now = new Date()
//         if (now - prev > wait) {
//             fn.apply(this, args)
//             prev = new Date()
//         }
//     }
// }


// window.addEventListener('resize', () => {
//     console.log('正常触发')
// })

// window.addEventListener('resize', throttle(() => {
//     console.log('延迟触发')
// }))



//组合起来


function throttle(fn, wait, isDebounce) {
    let lastCall = 0,
        timer
    return function (...args) {
        if (isDebounce) {
            if (timer) {
                clearTimeout(timer)
            }
            timer = setTimeout(() => {
                fn.apply(...args)
            }, wait)
        } else {

            let now = new Date()
            if (now - lastCall > wait) {
                fn.apply(this, ...args)
                lastCall = new Date()
            }
        }
    }
}






window.addEventListener('resize', () => {
    console.log('正常触发')
})

window.addEventListener('resize', throttle(() => {
    console.log('延迟触发')
},2000))