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angular服务注入的时候这里为什么没获取到数据？

0

1

angular基础

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

import { Component, OnInit } from '@angular/core';
import { Hero } from '../hero';
import { HeroService } from '../hero.service';

@Component({
  selector: 'app-heroes',
  templateUrl: './heroes.component.html',
  styleUrls: ['./heroes.component.scss']
})
export class HeroesComponent implements OnInit {

  constructor(private heroService: HeroService) {

  }
  heroes: Hero[];
  selectHero: Hero;
  getHeroes(): void {
    this.heroService.getHeroes().subscribe(heroes => heroes = heroes);
  }
  onSelect(hero: Hero) {
    this.selectHero = hero;
  }
  ngOnInit() {
    this.getHeroes();
  }

}

import { Injectable } from '@angular/core';
import { Hero } from "./hero";
import { HEROES } from "./mock-heroes";
import { MessageService } from "./message.service";
import { Observable, of } from "rxjs";
@Injectable({
  providedIn: 'root'
})
export class HeroService {

  constructor(private messageService: MessageService) { }
  getHeroes(): Observable<Hero[]> {
    this.messageService.add('HeroService: fetched heroes');
    return of(HEROES);
  }

}

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在点击登陆的时候，遇到了好多不懂得东西，比如说接口的问题，还不是很能理解关于接口

1

1

Ajax

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

// 获取input的数值
var ID = document.getElementById('ID');
// 第二个input的数值
var password = document.getElementsByClassName('password')[0];
var show = document.getElementById('show');
// 声明一个请求
var xhr;
// 点击事件，点击的时候获取到输入框输入的数值
function NEWbutton() {
    console.log(ID.value);
    console.log(password.value);
    if (ID.value == '') {
        show.innerHTML = '请输入账号'
        return false;
    } else if (password.value == '') {
        show.innerHTML = '请输入密码'
        return false;
    } else {
        // 请求参数
        var data = 'name=' + ID.value + '&pwd=' + password.value;
        var lin = '/carrots-admin-ajax/a/login';
        xhr = new XMLHttpRequest();
        xhr.onreadystatechange = function () {
            // 通信成功时，状态值为4
            if (xhr.readyState === 4 && xhr.status === 200) {
                var xuan = JSON.parse(xhr.responseText);
                console.log(xuan)
                if (xuan.code == 0) {
                    location.href = 'http://dev.admin.carrots.ptteng.com/#/dashboard'
                } else {
                    show.innerHTML = xuan.message;
                }
            } 
        }
    };
    xhr.open('POST', lin, true);
    xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
    xhr.send(data);
    return false;
}

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运行webpack命令一直提示安装webpack-cli

0

1

其他

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

ERROR in multi ./src/index.js ./dist/app.bundle.js Module not found: Error: Can't resolve './dist/app.bundle.js' in 
'E:\private\WebStudy\webPack\test'@ multi ./src/index.js ./dist/app.bundle.js

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完成投票后，如果一天杀手没有杀人，第一天的杀人信息会被第二天的信息给覆盖

0

1

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

<div class="head">
    <div class="h-img1"></div>
    法官台本
    <div class="h-img2"></div>
</div>

<div class="all">
<div class="addBox">
<div class="dateNow" id="now">第<span class="dayNum">1</span>天</div>

<div class="main-box">
    <div class="triangle"></div>

    <div class="box">

        <div class="border"></div>
        <div class="logo1"></div>
            <div class="kill mark1" >
                <div class="triLeft1 mark2"></div><span>杀手杀人</span></div>

            <!--<div class="killOld ">没有进行任何操作</div>-->

            <div class="tell mark1" >
                <div class="logo2"></div>
                <div class="triLeft2 mark2"></div><span>亡灵发表遗言</span></div>

 $(".dateNow").text("第"+dateNum+"天");

    for (var i=1; i<dateNum ; i++){
        var html =
            "<div class=\"addBox\">\n" +
            "<div class=\"date\" >第<span class=\"dayNum\">"+i+"</span>天</div>\n" +
            "<div class=\"main-box\">\n" +
            "    <div class=\"triangle\"></div>\n" +
            "    <div class=\"box\">\n" +
            "        <div class=\"border\"></div>\n" +
            "        <div class=\"logo1\"></div>\n" +
            "            <div class=\"kill mark1\" >\n" +
            "                <div class=\"triLeft1 mark2\"></div><span>杀手杀人</span></div>\n" +
            "            <div class=\"killOld \">"+(Number(arrKillDead[i-1]+1))+"号被杀手杀了，真实身份是平民</div>\n" +
            "            <div class=\"tell mark1\" >\n" +
            "                <div class=\"logo2\"></div>\n" +
            "                <div class=\"triLeft2 mark2\"></div><span>亡灵发表遗言</span></div>\n" +
            "            <div class=\"speak mark1\" >\n" +
            "                <div class=\"triLeft3 mark2\"></div><span>玩家依次发言</span></div>\n" +
            "            <div class=\"vote mark1\" >\n" +
            "                <div class=\"triLeft4 mark2\"></div><span>全民投票</span></div>\n" +
            "    </div>\n" +
            "    </div>\n" +
            "</div>";

        $(".addBox").eq(i-1).before(html);
        $(".addBox").eq(i-1).find(".main-box").hide();
        //隐藏前天盒子
        $(".box").eq(i-1).find(".mark1").css({background:"#2375af"});
        $(".box").eq(i-1).find(".mark2").css({borderColor:"transparent #2375af transparent transparent"});

        // function aboutKillED () {
        //     if (deadeNum[dateNum-2] == "X") {
        //         $(".kill").eq(i-1).after("<div class='killTxt'>" +
        //             '没有进行任何操作' +
        //             "</div>");
        //     }
        //     else  {
        //         $(".kill").eq(i-1).after("<div class='killTxt'>" + (Number(arrKillDead[i-1])+1) +
        //             '号被杀手杀了，真实身份是平民' +
        //             "</div>");
        //     }
        // }
        // aboutKillED();
        // abuotVotED();
        //思路一（无操作还是有点问题）

        if (arrKillDead[i-1] === "n"){
            $('.killOld').eq(i-1).text("晚上：平安无事");
        }
        $(".vote").eq(i-1).after("<div class='killTxt'>" + (Number(arrVoteDead[i-1])+1) +
            '号被投死了，真实身份是' + (identity[voteDeade]) +
            "</div>");

        $('.all').scrollTop(9999);
    }

    $(".date").click(function () {
        $(this).next().slideToggle();
    });

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我写了6种随机颜色的方法怎么比较各种随机颜色的性能？

0

1

变量操作DOM

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

如何才能判断一下六种随机颜色代码的性能？

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动态设置select的选项值，无效

0

1

angular model

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

$scope.startAt=$scope.inputData.startAt;
$scope.endAt=$scope.inputData.endAt;
console.log($scope.inputData.type);
$scope.selectedType=myConstant.types.type4;//使用常量中的数据
console.log($scope.selectedType);
$scope.selectedState=$scope.inputData.status;//使用会话存储中的数据

<div class="col-md-4 col-sm-12">
        <div class="row">
            <label class="col-md-4 col-sm-4">类    型</label>
            <div class="col-md-8 col-sm-12">
                <select  ng-init="selectedType = types.type1"
                         ng-model="selectedType"
                         ng-options="y.type for (x, y) in types">
                </select>
                <span>{{selectedType}}</span>
            </div>
        </div>
    </div>
    <div class="col-md-4 col-sm-12">
        <div class="row">
            <label class="col-md-4 col-sm-4">状    态</label>
            <div class="col-md-8 col-sm-12">
                <select  ng-init="selectedState = initSelectedState"
                         ng-model="selectedState"
                         ng-options="y.state for (x,y) in states">
                </select>
                <span>{{selectedState}}</span>
            </div>
        </div>
    </div>
</div>

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状态机的状态不会保存

0

1

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

无

该问题已被官方收录

如何保存状态机的状态

0

1

有限状态机

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

无

该问题已被官方收录

当根据后端返回的数组渲染数据的时候

0

1

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

该问题已被官方收录

页面打开的时候都会报错

0

1

其他

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 图片

class="cursor-pointer"> 文本

去第页

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