无法构造'undefined'或'null'的属性`obj1`
我正在尝试在函数参数中进行解构,但我收到如下错误,
TypeError:无法解析'undefined'或'null'的属性
obj1
。
var deepDiffMapper = function() {
return {
VALUE_CREATED: 'created',
VALUE_UPDATED: 'updated',
VALUE_DELETED: 'deleted',
VALUE_UNCHANGED: 'unchanged',
map: function({
obj1,
obj2
}) {
if (this.isFunction(obj1) || this.isFunction(obj2)) {
throw 'Invalid argument. Function given, object expected.';
}
if (this.isValue(obj1) || this.isValue(obj2)) {
return {
type: thispareValues(obj1, obj2),
data: (obj1 === undefined) ? obj2 : obj1
};
}
/* Error On Uncomment
var diff = {};
for (var key in obj1) {
if (this.isFunction(obj1[key])) {
continue;
}
var value2 = undefined;
if ('undefined' != typeof (obj2[key])) {
value2 = obj2[key];
}
diff[key] = this.map(obj1[key], value2);
}
for (var key in obj2) {
if (this.isFunction(obj2[key]) || ('undefined' != typeof (diff[key]))) {
continue;
}
diff[key] = this.map(undefined, obj2[key]);
}
return diff;
*/
},
compareValues: function(value1, value2) {
if (value1 === value2) {
return this.VALUE_UNCHANGED;
}
if (this.isDate(value1) && this.isDate(value2) && value1.getTime() === value2.getTime()) {
return this.VALUE_UNCHANGED;
}
if ('undefined' == typeof(value1)) {
return this.VALUE_CREATED;
}
if ('undefined' == typeof(value2)) {
return this.VALUE_DELETED;
}
return this.VALUE_UPDATED;
},
isFunction: function(obj) {
return {}.toString.apply(obj) === '[object Function]';
},
isArray: function(obj) {
return {}.toString.apply(obj) === '[object Array]';
},
isDate: function(obj) {
return {}.toString.apply(obj) === '[object Date]';
},
isObject: function(obj) {
return {}.toString.apply(obj) === '[object Object]';
},
isValue: function(obj) {
return !this.isObject(obj) && !this.isArray(obj);
}
}
}();
var result = deepDiffMapper.map({
"obj1": {
a: 'i am unchanged',
b: 'i am deleted',
e: {
a: 1,
b: false,
c: null
},
f: [1, {
a: 'same',
b: [{
a: 'same'
}, {
d: 'delete'
}]
}],
g: new Date('2017.11.25')
},
"obj2": {
a: 'i am unchanged',
c: 'i am created',
e: {
a: '1',
b: '',
d: 'created'
},
f: [{
a: 'same',
b: [{
a: 'same'
}, {
c: 'create'
}]
}, 1],
g: new Date('2017.11.25')
}
});
console.log(result);
回答如下:
你用错误的参数递归调用你的map
函数。
diff[key] = this.map(obj1[key], value2)
这需要一个具有obj1
和obj2
的对象,因此它可以正确地对其进行解构。
你应该尝试两个内部map
调用:
diff[key] = this.map({obj1: obj1[key], obj2: value2)
无法构造'undefined'或'null'的属性`obj1`
我正在尝试在函数参数中进行解构,但我收到如下错误,
TypeError:无法解析'undefined'或'null'的属性
obj1
。
var deepDiffMapper = function() {
return {
VALUE_CREATED: 'created',
VALUE_UPDATED: 'updated',
VALUE_DELETED: 'deleted',
VALUE_UNCHANGED: 'unchanged',
map: function({
obj1,
obj2
}) {
if (this.isFunction(obj1) || this.isFunction(obj2)) {
throw 'Invalid argument. Function given, object expected.';
}
if (this.isValue(obj1) || this.isValue(obj2)) {
return {
type: thispareValues(obj1, obj2),
data: (obj1 === undefined) ? obj2 : obj1
};
}
/* Error On Uncomment
var diff = {};
for (var key in obj1) {
if (this.isFunction(obj1[key])) {
continue;
}
var value2 = undefined;
if ('undefined' != typeof (obj2[key])) {
value2 = obj2[key];
}
diff[key] = this.map(obj1[key], value2);
}
for (var key in obj2) {
if (this.isFunction(obj2[key]) || ('undefined' != typeof (diff[key]))) {
continue;
}
diff[key] = this.map(undefined, obj2[key]);
}
return diff;
*/
},
compareValues: function(value1, value2) {
if (value1 === value2) {
return this.VALUE_UNCHANGED;
}
if (this.isDate(value1) && this.isDate(value2) && value1.getTime() === value2.getTime()) {
return this.VALUE_UNCHANGED;
}
if ('undefined' == typeof(value1)) {
return this.VALUE_CREATED;
}
if ('undefined' == typeof(value2)) {
return this.VALUE_DELETED;
}
return this.VALUE_UPDATED;
},
isFunction: function(obj) {
return {}.toString.apply(obj) === '[object Function]';
},
isArray: function(obj) {
return {}.toString.apply(obj) === '[object Array]';
},
isDate: function(obj) {
return {}.toString.apply(obj) === '[object Date]';
},
isObject: function(obj) {
return {}.toString.apply(obj) === '[object Object]';
},
isValue: function(obj) {
return !this.isObject(obj) && !this.isArray(obj);
}
}
}();
var result = deepDiffMapper.map({
"obj1": {
a: 'i am unchanged',
b: 'i am deleted',
e: {
a: 1,
b: false,
c: null
},
f: [1, {
a: 'same',
b: [{
a: 'same'
}, {
d: 'delete'
}]
}],
g: new Date('2017.11.25')
},
"obj2": {
a: 'i am unchanged',
c: 'i am created',
e: {
a: '1',
b: '',
d: 'created'
},
f: [{
a: 'same',
b: [{
a: 'same'
}, {
c: 'create'
}]
}, 1],
g: new Date('2017.11.25')
}
});
console.log(result);
回答如下:
你用错误的参数递归调用你的map
函数。
diff[key] = this.map(obj1[key], value2)
这需要一个具有obj1
和obj2
的对象,因此它可以正确地对其进行解构。
你应该尝试两个内部map
调用:
diff[key] = this.map({obj1: obj1[key], obj2: value2)
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