e.preventDefault();

但是在angular中，需要单独定义指令，用@Input进行数据绑定，传递给父元素值，再用@Output将此事件发射出去，让父元素能够接收到；

 

指令文件：

import {Directive, ElementRef, EventEmitter, Input, OnInit, Output} from "@angular/core";

@Directive({  
  selector: '[cp-right-click]', //选择你
})

export class CPRightClickDirective implements OnInit{
  @Input('cp-right-click') rightClick: number;//Input将数据从绑定表达式传达到指令中。
  @Output() rightClickEvent: EventEmitter<any> = new EventEmitter();
  constructor(public el: ElementRef){} //ElementRef注入到指令构造函数中。这样代码就可以访问 DOM 元素了。
  ngOnInit(){
    let self = this;
    this.el.nativeElement.addEventListener('contextmenu', function (event) {
      event.preventDefault();//阻止默认行为 
      self.rightClickEvent.emit(self.rightClick);//发射事件
    })
  }
}

父元素html文件：

<div nz-col [nzSpan]="3" *ngFor="let list of healList; let i = index" style="position: relative;">
  <dl class="add-project-dl" >
    <dt [cp-right-click]="i" (rightClickEvent)='rightClickHandler($event)' (mouseout)="hideCon(i)">
      <img src="{{list.logopath}}"/>
      <div class="play-group"
           [style.display]="list.visible ? 'block' : 'none'"
           (mousemove)="groupShow(i)"
           (mouseout)="groupHide(i)">
        <p (click)="editPlaFrom(list)">编辑</p>
        <p (click)="delPlaFrom(list)">删除</p>
      </div>
    </dt>
  <dd>{{list.name}}</dd>
</dl>
</div>
现在父元素接收到了子元素指令发射的事件，并绑定了rightClickHandler（$event）事件，这时可以在父元素中定义事件，控制右键菜单的显示与隐藏；
注：定时器是为了控制鼠标划入划出时，菜单是否显示隐藏，相当于加了一层锁，滑到别处时，那么菜单操作就会被隐藏，同时又保证了流畅性；

this.healList = [];//循环肯定要有数组 此数组是动态渲染的   html中的 ‘let i = index’ 是为了获取点击元素的index
for(let i in data){
  this.healList.push({
    name: data[i].name,
    linkpath: data[i].linkpath,
    logopath: data[i].logopath,
    id: data[i].id,
    isdeleted: data[i].isdeleted,
    visible: false
  })
}
父文件中的事件：
rightClickHandler(clickIndex){
  let self = this;
  this.clearLockedTimeOut();
  this. detailShowLock = setTimeout(function () {
    self.healList.forEach(list => {
      list.visible = false;
    });
    self.healList[clickIndex].visible = true;
  }, 250);
}
//以下是划入划出控制事件

clearLockedTimeOut() {
  let self = this;
  if (this.detailShowLock) {
    clearTimeout(self.detailShowLock);
  }
  if (this.detailCloseLock) {
    clearTimeout(self.detailCloseLock);
  }
}

hideCon(clickIndex){
  let self = this;
  this.clearLockedTimeOut();
  this.detailCloseLock = setTimeout(function () {
    self.healList[clickIndex].visible = false;
  }, 250);
}
groupShow(clickIndex){
  this.clearLockedTimeOut();
  this.healList[clickIndex].visible = true;
}
groupHide(clickIndex){
  let self = this;
  this.clearLockedTimeOut();
  this.detailCloseLock = setTimeout(function () {
    self.healList[clickIndex].visible = false;
  }, 250);
}

每天记录一点点 开心