zent/es/utils/shallowEqual.js

一套前端设计语言和基于React的实现

var hasOwnProperty = Object.prototype.hasOwnProperty;
function is(x, y) {
    if (x === y) {
        return x !== 0 || 1 / x === 1 / y;
    }
    return x !== x && y !== y;
}
function shallowEqual(objA, objB) {
    if (is(objA, objB)) {
        return true;
    }
    if (typeof objA !== 'object' ||
        objA === null ||
        typeof objB !== 'object' ||
        objB === null) {
        return false;
    }
    var keysA = Object.keys(objA);
    var keysB = Object.keys(objB);
    if (keysA.length !== keysB.length) {
        return false;
    }
    for (var i = 0; i < keysA.length; i++) {
        if (!hasOwnProperty.call(objB, keysA[i]) ||
            !is(objA[keysA[i]], objB[keysA[i]])) {
            return false;
        }
    }
    return true;
}
export default shallowEqual;