我正试图迭代中间件函数内的猫鼬模型中的字段。当前上下文this
是模型对象本身。所以我有一个功能,其中的背景是一个Javascript对象是这样的:如何遍历中间件函数中的Mongoose模型属性?
{
lastName: 'Wilkens',
firstName: 'Elepart',
name: 'Elepart Wilkens',
username: 'eK',
bio: '<script>alert(\'this is a hack!!\')',
_id: 53b17dd0e8c5af50c1d73bc6,
language: 'en',
country: 'USA',
online: true
}
我想这个对象(这在目前的函数表示与this
)遍历。每次我尝试循环迭代时,它都会输出看起来像内部Javascript元数据的值。如果this
代表一个对象,是否有可能在函数内迭代this
?
下面是实际的中间件功能:
userSchema.pre('save', function (next) {
console.log(this); // This prints precisely the same object I have copied above
var fields = Object.keys(this);
for(var i = 0; i < fields.length; i++) {
console.log(this[fields[i]]);
}
for(var key in this) {
if(this.hasOwnProperty(key)) {
console.log(this[key]);
}
}
});
,输出是:
{
strictMode: true,
selected: undefined,
shardval: undefined,
saveError: undefined,
validationError: undefined,
adhocPaths: undefined,
removing: undefined,
inserting: undefined,
version: undefined,
getters: {},
_id: undefined,
populate: undefined,
populated: undefined,
wasPopulated: false,
scope: undefined,
activePaths:
{ paths:
{ username: 'modify',
firstName: 'modify',
name: 'modify',
online: 'default',
country: 'default',
language: 'default',
_id: 'default',
bio: 'modify',
lastName: 'modify' },
states: { default: [Object], init: {}, modify: [Object], require: {} },
stateNames: [ 'require', 'modify', 'init', 'default' ],
map: [Function] },
ownerDocument: undefined,
fullPath: undefined }
true
undefined
0
{ online: true,
country: 'USA',
language: 'en',
_id: 53b1825a00ed9af7c12eedf9,
bio: '<script>alert(\'this is a hack!!\')',
username: 'yK',
name: 'Yershay Wilkens',
firstName: 'Yershay',
lastName: 'Wilkens' }
{ save:
[ { [Function] isAsync: false },
{ [Function: checkForExistingErrors] isAsync: false },
{ [Function: validation] isAsync: false },
{ [Function] isAsync: false },
{ [Function] isAsync: false } ],
validate: [ { [Function] isAsync: false } ] }
{ save: [], validate: [] }
{ [Function] numAsyncPres: 0 }
{ [Function] numAsyncPres: 0 }
{}
你可以发布您当前使用的循环? – Duane
或者你可以设置一个小提琴?我认为这是可能的 –
没有更多的代码,我们不能帮你。虽然这是一个如何工作的例子:http://jsbin.com/gomisuyu/1/ – Yoshi