//enquire.js 纯 JavaScript 实现的 CSS 媒体查询库
import enquireJs from "enquire.js";

export function isDef(v) {
    return v !== undefined && v !== null;
}

/**
 * Remove an item from an array.
 */
export function remove(arr, item) {
    if (arr.length) {
        const index = arr.indexOf(item);
        if (index > -1) {
            return arr.splice(index, 1);
        }
    }
}

export function isRegExp(v) {
    return _toString.call(v) === "[object RegExp]";
}

export function enquireScreen(call) {
    const handler = {
        match: function() {
            call && call(true);
        },
        unmatch: function() {
            call && call(false);
        },
    };
    enquireJs.register("only screen and (max-width: 767.99px)", handler);
}

const _toString = Object.prototype.toString;