React组件属性类型（propTypes）

React.createClass({
propTypes: {
// You can declare that a prop is a specific JS primitive. By default, these
// are all optional.
optionalArray: React.PropTypes.array,
optionalBool: React.PropTypes.bool,
optionalFunc: React.PropTypes.func,
optionalNumber: React.PropTypes.number,
optionalObject: React.PropTypes.object,
optionalString: React.PropTypes.string,
optionalSymbol: React.PropTypes.symbol,

// Anything that can be rendered: numbers, strings, elements or an array
// (or fragment) containing these types.
optionalNode: React.PropTypes.node,

// A React element.
optionalElement: React.PropTypes.element,

// You can also declare that a prop is an instance of a class. This uses
// JS's instanceof operator.
optionalMessage: React.PropTypes.instanceOf(Message),

// You can ensure that your prop is limited to specific values by treating
// it as an enum.
optionalEnum: React.PropTypes.oneOf(['News', 'Photos']),

// An object that could be one of many types
optionalUnion: React.PropTypes.oneOfType([
React.PropTypes.string,
React.PropTypes.number,
React.PropTypes.instanceOf(Message)
]),

// An array of a certain type
optionalArrayOf: React.PropTypes.arrayOf(React.PropTypes.number),

// An object with property values of a certain type
optionalObjectOf: React.PropTypes.objectOf(React.PropTypes.number),

// An object taking on a particular shape
optionalObjectWithShape: React.PropTypes.shape({
color: React.PropTypes.string,
fontSize: React.PropTypes.number
}),

// You can chain any of the above with `isRequired` to make sure a warning
// is shown if the prop isn't provided.
requiredFunc: React.PropTypes.func.isRequired,

// A value of any data type
requiredAny: React.PropTypes.any.isRequired,

// You can also specify a custom validator. It should return an Error
// object if the validation fails. Don't `console.warn` or throw, as this
// won't work inside `oneOfType`.
customProp: function(props, propName, componentName) {
if (!/matchme/.test(props[propName])) {
return new Error(
'Invalid prop `' + propName + '` supplied to' +
' `' + componentName + '`. Validation failed.'
);
}
},

// You can also supply a custom validator to `arrayOf` and `objectOf`.
// It should return an Error object if the validation fails. The validator
// will be called for each key in the array or object. The first two
// arguments of the validator are the array or object itself, and the
// current item's key.
customArrayProp: React.PropTypes.arrayOf(function(propValue, key, componentName, location, propFullName) {
if (!/matchme/.test(propValue[key])) {
return new Error(
'Invalid prop `' + propFullName + '` supplied to' +
' `' + componentName + '`. Validation failed.'
);
}
})
},
/* ... */
});