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let timeoutArr = [ ] ;
let flagArr = [ ] ;
/**
* 节流函数
* 节流原理：在一定时间内，只能触发一次
* @param {Function} fn 要执行的回调函数
* @param {Number} time 延时的时间
* @param {Boolean} isImmediate 是否立即执行
* @param {String} timeoutName 定时器ID
* @return null
*/
function throttle ( fn , time = 500 , isImmediate = true , timeoutName = "default" ) {
if ( ! timeoutArr [ timeoutName ] ) timeoutArr [ timeoutName ] = null ;
if ( isImmediate ) {
if ( ! flagArr [ timeoutName ] ) {
flagArr [ timeoutName ] = true ;
// 如果是立即执行，
if ( typeof fn === 'function' ) fn ( ) ;
timeoutArr [ timeoutName ] = setTimeout ( ( ) => {
flagArr [ timeoutName ] = false ;
} , time ) ;
}
} else {
if ( ! flagArr [ timeoutName ] ) {
flagArr [ timeoutName ] = true ;
// 如果是非立即执行，
timeoutArr [ timeoutName ] = setTimeout ( ( ) => {
flagArr [ timeoutName ] = false ;
if ( typeof fn === 'function' ) fn ( ) ;
} , time ) ;
}
}
} ;
export default throttle