js判断两个对象是否相等

有两个对象obj1和obj2

let obj1 = {
   a = 1
}
let obj2 = {
   a = 1
}

比较obj1和obj2：

obj1 == obj2 //false
obj1 === obj2 //false

obj1和obj2不是同一个指针对象，因此不相等。
下面是比较他们的正确方法：

方法一
比较两个对象的名和键值，都相同，那么两个对象相等。

isObjectValueEqual = (a, b) => {
    // Of course, we can do it use for in 
    // Create arrays of property names
    var aProps = Object.getOwnPropertyNames(a);
    var bProps = Object.getOwnPropertyNames(b);
    
    // If number of properties is different,
    // objects are not equivalent
    if (aProps.length != bProps.length) {
        return false;
    }
    
    for (var i = 0; i < aProps.length; i++) {
        var propName = aProps[i];
    
        // If values of same property are not equal,
        // objects are not equivalent
        if (a[propName] !== b[propName]) {
            return false;
        }
    }
    
    // If we made it this far, objects
    // are considered equivalent
    return true;
}

方法二
对象里包含对象或者嵌套数组时，加递归。

isObjectValueEqual = (a, b) => {
    var aProps = Object.getOwnPropertyNames(a);
    var bProps = Object.getOwnPropertyNames(b);
    if (aProps.length != bProps.length) {
        return false;
    }
    for (var i = 0; i < aProps.length; i++) {
        var propName = aProps[i]
        var propA = a[propName]
        var propB = b[propName]
        if ((typeof (propA) === 'object')) {
            if (this.isObjectValueEqual(propA, propB)) {
                return true
            } else {
                return false
            }
        } else if (propA !== propB) {
            return false
        } else { }
    }
    return true
}

方法二代码链接

https://www.jianshu.com/p/7407bd65b15d

this.isObjectValueEqual(obj1, obj2); //true