ewm/dist/behaviors/BComputedWatch/fast-deep-equal.js

小程序原生插件

const isArray = Array.isArray;
const keyList = Object.keys;
const hasProp = Object.prototype.hasOwnProperty;
export function deepEqual(a, b) {
    if (a === b)
        return true;
    if (a && b && typeof a == "object" && typeof b == "object") {
        const arrA = isArray(a), arrB = isArray(b);
        let i, length, key;
        if (arrA && arrB) {
            length = a.length;
            if (length != b.length)
                return false;
            for (i = length; i-- !== 0;) {
                if (!deepEqual(a[i], b[i]))
                    return false;
            }
            return true;
        }
        if (arrA != arrB)
            return false;
        const dateA = a instanceof Date, dateB = b instanceof Date;
        if (dateA != dateB)
            return false;
        if (dateA && dateB)
            return a.getTime() == b.getTime();
        const regexpA = a instanceof RegExp, regexpB = b instanceof RegExp;
        if (regexpA != regexpB)
            return false;
        if (regexpA && regexpB)
            return a.toString() == b.toString();
        const keys = keyList(a);
        length = keys.length;
        if (length !== keyList(b).length) {
            return false;
        }
        for (i = length; i-- !== 0;) {
            if (!hasProp.call(b, keys[i]))
                return false;
        }
        for (i = length; i-- !== 0;) {
            key = keys[i];
            if (!deepEqual(a[key], b[key]))
                return false;
        }
        return true;
    }
    return a !== a && b !== b;
}
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