[英]Javascript One after another method call
I want to javascript validation for __NodeJS Rest API__
, but my problem is; 我想对
__NodeJS Rest API__
进行JavaScript验证,但是我的问题是;
Validator Class 验证者类别
class Checks {
constructor() {
}
object(field) {
return field;
}
keys(field) {
if(typeof field === "string") {
return true;
}
return false;
}
}
module.exports = Validator;
and I want to use 我想用
Validator.validate(field).string()
but error code: 但错误代码:
You can assign field as a property of the current instance then return the this
for chaining methods. 您可以将field分配为当前实例的属性,然后为链接方法返回
this
。
class Validator {
constructor() {
this.field = null;
}
validate(field) {
this.field = field;
return this;
}
string(field) {
return typeof this.field === "string";
}
}
module.exports = Validator;
//usage
const Validator = require('path/to/Validator');
new Validator().validate(field).string();
You can change like, 您可以像这样更改
class Validator {
constructor() {
}
validate(field) {
if(typeof field === "string") {
return true;
}
return false;
}
}
module.exports = Validator;
And make a call like, 打个电话,
Validator.validate(field)
Or simply change the validate function as, 或者只是将validate函数更改为
validate() {
return this;
}
And call it like, 然后这样称呼它,
Validator.validate().string(field)
//validator-factory.js
class ValidatorFactory {
static validate(field) {
return new Validator(field);
}
}
class Validator {
constructor(field) {
this.field = field;
}
string() {
if(typeof this.field === "string") {
return true;
}
return false;
}
}
module.exports = ValidatorFactory;
Then, import ValidatorFactory
& use as follows 然后,导入
ValidatorFactory
并按以下方式使用
var ValidatorFactory = require('./validator-factory');
ValidatorFactory.validate(field).string();
Note the use of static
keyword in ValidatorFactory
& validate
returns new instance of Validator
class every time. 请注意,在
ValidatorFactory
使用static
关键字,并且validate
每次都会返回Validator
类的新实例。
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