//防止多次重复点击  （函数节流）
export function throttle(fn, gapTime) {
    if (gapTime == null || gapTime == undefined) {
        gapTime = 1500
    }
    let _lastTime = null
    return function (e) {
        let _nowTime = + new Date()
        if (_nowTime - _lastTime > gapTime || !_lastTime) {
            fn(e)
            _lastTime = _nowTime
        }
    }
}