在Angular中做到这一点并保持代码简单的最好方法就是使用这个项目。

https://www.npmjs.com/package/ngx-clipboard

    <fa-icon icon="copy" ngbTooltip="Copy to Clipboard" aria-hidden="true" 
    ngxClipboard [cbContent]="target value here" 
    (cbOnSuccess)="copied($event)"></fa-icon>

从Angular Material v9开始，它现在有了一个剪贴板CDK

剪贴板|角材料

它可以简单地使用

<button [cdkCopyToClipboard]="This goes to Clipboard">Copy this</button>

// for copy the text
import { Clipboard } from "@angular/cdk/clipboard"; // first import this in .ts
 constructor(
    public clipboard: Clipboard
  ) { }   
 <button class="btn btn-success btn-block"(click) = "onCopy('some text')" > Copy< /button>

 onCopy(value) {
     this.clipboard.copy(value);
    }


 // for paste the copied text on button click :here is code
    
    <button class="btn btn-success btn-block"(click) = "onpaste()" > Paste < /button>
    
    onpaste() {
      navigator['clipboard'].readText().then(clipText => {
        console.log(clipText);
      });
    }

很简单，兄弟

在.html文件

<button (click)="copyMessage('This goes to Clipboard')" value="click to copy" >Copy this</button>

在.ts文件

copyMessage(text: string) {
  navigator.clipboard.writeText(text).then().catch(e => console.log(e));
}

第一个建议的解决方案是有效的，我们只需要改变

selBox.value = val;

To

selBox.innerText = val;

也就是说,

HTML:

<button (click)="copyMessage('This goes to Clipboard')" value="click to copy" >Copy this</button>

.ts文件:

copyMessage(val: string){
    const selBox = document.createElement('textarea');
    selBox.style.position = 'fixed';
    selBox.style.left = '0';
    selBox.style.top = '0';
    selBox.style.opacity = '0';
    selBox.innerText = val;
    document.body.appendChild(selBox);
    selBox.focus();
    selBox.select();
    document.execCommand('copy');
    document.body.removeChild(selBox);
  }

用纯Angular和ViewChild为自己找到了最简单的解决方案。

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

@Component({
  selector: 'cbtest',
  template: `
    <input type="text" #inp/>
    <input type="button" (click)="copy ()" value="copy now"/>`
})

export class CbTestComponent
{
  @ViewChild ("inp") inp : any;

  copy ()
  {
    // this.inp.nativeElement.value = "blabla";  // you can set a value manually too

    this.inp.nativeElement.select ();   // select
    document.execCommand ("copy");      // copy
    this.inp.nativeElement.blur ();     // unselect
  }
}