以this为例:
interface DOMPoint extends DOMPointReadOnly {
w: number;
x: number;
y: number;
z: number;
}
declare var DOMPoint: {
prototype: DOMPoint;
new(x?: number, y?: number, z?: number, w?: number): DOMPoint;
fromPoint(other?: DOMPointInit): DOMPoint;
};
interface DOMPointReadOnly {
readonly w: number;
readonly x: number;
readonly y: number;
readonly z: number;
matrixTransform(matrix?: DOMMatrixInit): DOMPoint;
toJSON(): any;
}
declare var DOMPointReadOnly: {
prototype: DOMPointReadOnly;
new(x?: number, y?: number, z?: number, w?: number): DOMPointReadOnly;
fromPoint(other?: DOMPointInit): DOMPointReadOnly;
};
interface DOMQuad {
readonly p1: DOMPoint;
readonly p2: DOMPoint;
readonly p3: DOMPoint;
readonly p4: DOMPoint;
getBounds(): DOMRect;
toJSON(): any;
}
为什么他们要用不同的 struct 声明一个与接口同名的大写变量？这是什么意思？在DOMQuad中，当他们引用DOMPoint时，他们是引用var还是interface？风险价值的目的是什么？