angular4+ionic3数据请求方法 post get h

1.get请求 

1.创建服务，并引入

import{Injectable}from'@angular/core';

import{Http}from'@angular/http';

import'rxjs/add/operator/map';

@Injectable()

exportclassCategoryListServiceProvider{

constructor(publichttp:Http) {

}

publicgetList(params) {

console.log(params);

returnnewPromise((resolve,reject)=>{

this.http.get('http://api.maidanfan.la/UserApp/Index/categoryMerchant',{search:params})

.map(res=>res.json())

.subscribe(data=>{

resolve(data);

},err=>{

reject(err);

})

})

}

}

2.在需要调用的ts文件引入以下服务和方法

import{Component}from'@angular/core';

import{IonicPage,NavController,NavParams}from'ionic-angular';

import{URLSearchParams}from'@angular/http';

import{CategoryListServiceProvider}from'./../../../providers/category-list-service/category-list-service';

3调用服务

exportclassCategoryListPage{

constructor(publicnavCtrl:NavController,publicnavParams:NavParams,publicservice:CategoryListServiceProvider) {

letgid=navParams.data;

letparams:URLSearchParams=newURLSearchParams();

params.set('city_id','1');//城市ID

params.set('lat','34.2351921');

params.set('lng','108.9421249');

params.set('p','1');

params.set('order','1');

params.set('group_id',gid);

this.service.getList(params).then(

data=>{

letdataString=JSON.stringify(data);

letdataJson=JSON.parse(dataString);

console.log(dataJson)

})

}

ionViewDidLoad() {

console.log('ionViewDidLoad CategoryListPage');

}

}

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2.解决post请求问题

1.服务和get不同

2.使用先引入以下

3.使用headers请求头，可代参