2a09d1a4
 liuqimichale
添加宜春 天水 宣化
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/* eslint-disable no-undefined */
var throttle = require('./throttle');
/**
* Debounce execution of a function. Debouncing, unlike throttling,
* guarantees that a function is only executed a single time, either at the
* very beginning of a series of calls, or at the very end.
*
* @param {Number} delay A zero-or-greater delay in milliseconds. For event callbacks, values around 100 or 250 (or even higher) are most useful.
* @param {Boolean} [atBegin] Optional, defaults to false. If atBegin is false or unspecified, callback will only be executed `delay` milliseconds
* after the last debounced-function call. If atBegin is true, callback will be executed only at the first debounced-function call.
* (After the throttled-function has not been called for `delay` milliseconds, the internal counter is reset).
* @param {Function} callback A function to be executed after delay milliseconds. The `this` context and all arguments are passed through, as-is,
* to `callback` when the debounced-function is executed.
*
* @return {Function} A new, debounced function.
*/
module.exports = function ( delay, atBegin, callback ) {
return callback === undefined ? throttle(delay, atBegin, false) : throttle(delay, callback, atBegin !== false);
};
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