zent/es/utils/throttle.js

一套前端设计语言和基于React的实现

export default function throttle(func, wait, options) {
    if (options === void 0) { options = {}; }
    var timerId;
    var result;
    var args;
    var previous = 0;
    var _a = options.immediate, immediate = _a === void 0 ? false : _a;
    var later = function () {
        previous = immediate === false ? 0 : Date.now();
        timerId = null;
        result = func.apply(void 0, args);
        if (!timerId) {
            args = null;
        }
    };
    var throttled = function () {
        var params = [];
        for (var _i = 0; _i < arguments.length; _i++) {
            params[_i] = arguments[_i];
        }
        var now = Date.now();
        if (!previous && immediate === false) {
            previous = now;
        }
        var remaining = wait - (now - previous);
        args = params;
        if (remaining <= 0 || remaining > wait) {
            if (timerId) {
                clearTimeout(timerId);
                timerId = null;
            }
            previous = now;
            result = func.apply(void 0, args);
            if (!timerId) {
                args = null;
            }
        }
        else if (!timerId && immediate === false) {
            timerId = setTimeout(later, remaining);
        }
        return result;
    };
    throttled.cancel = function () {
        clearTimeout(timerId);
        previous = 0;
        timerId = args = null;
    };
    return throttled;
}