ANGLING:HttpRequest.Clone()-参数和setParams之间有什么区别? [英] Angular: HttpRequest.clone() - What is the difference between params and setParams?
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问题描述
我有一个拦截器:
intercept(request, next) {
const _id = 1
const _token = "foo"
return next.handle(request.clone({
setParams: {
user_id: _id,
user_token: _token
}
});
}
我注意到,不是setParams
,而是params
字段?
HttpRequest
类的角度网站文档上没有任何见解。它显示他们在那里,但没有任何信息。
params
是硬覆盖,setParams
是将额外的Key->Value
对追加到请求的方法吗?
推荐答案
HttpRequest.clone()
方法提供支持传递update
对象的重载:
clone(update: { headers?: HttpHeaders; reportProgress?: boolean;
params?: HttpParams; responseType?: "arraybuffer" | "blob" | "text" | "json";
withCredentials?: boolean; body?: T; method?: string; url?: string;
setHeaders?: { ...; }; setParams?: { ...; }; }): HttpRequest<T>
params
-提供使用HttpParams
实例分配HTTP参数的选项,覆盖进程中的现有参数。setParams
-提供使用对象文字追加HTTP参数的选项,其中键是要设置的参数的名称。
Source code for clone()
method
clone(update: {
headers?: HttpHeaders,
reportProgress?: boolean,
params?: HttpParams,
responseType?: 'arraybuffer'|'blob'|'json'|'text',
withCredentials?: boolean,
body?: any|null,
method?: string,
url?: string,
setHeaders?: {[name: string]: string | string[]},
setParams?: {[param: string]: string};
} = {}): HttpRequest<any> {
// For method, url, and responseType, take the current value unless
// it is overridden in the update hash.
const method = update.method || this.method;
const url = update.url || this.url;
const responseType = update.responseType || this.responseType;
// The body is somewhat special - a `null` value in update.body means
// whatever current body is present is being overridden with an empty
// body, whereas an `undefined` value in update.body implies no
// override.
const body = (update.body !== undefined) ? update.body : this.body;
// Carefully handle the boolean options to differentiate between
// `false` and `undefined` in the update args.
const withCredentials =
(update.withCredentials !== undefined) ? update.withCredentials : this.withCredentials;
const reportProgress =
(update.reportProgress !== undefined) ? update.reportProgress : this.reportProgress;
// Headers and params may be appended to if `setHeaders` or
// `setParams` are used.
let headers = update.headers || this.headers;
let params = update.params || this.params;
// Check whether the caller has asked to add headers.
if (update.setHeaders !== undefined) {
// Set every requested header.
headers = Object.keys(update.setHeaders)
.reduce((headers, name) => headers.set(name, update.setHeaders ![name]), headers);
}
// Check whether the caller has asked to set params.
if (update.setParams) {
// Set every requested param.
params = Object.keys(update.setParams)
.reduce((params, param) => params.set(param, update.setParams ![param]), params);
}
// Finally, construct the new HttpRequest using the pieces from above.
return new HttpRequest(
method, url, body, { params, headers, reportProgress, responseType, withCredentials, });
}
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