错误TS2339：JavaScript到打字稿错误

ERROR in src/app/dashboard.component.ts(49,15): error TS2339: Property
‘style’ does not exist on type ‘Element’.
src/app/dashboard.component.ts(50,16): error TS2339: Property
‘textContent’ does not exist on type ‘EventTarget’.

这可以用作javascript函数,但是以上是我在打字稿中尝试使用此错误.我尝试将var更改为let和add.还有其他建议吗？谢谢.

仪表板

var w = document.getElementById('wrapper');
var button = document.getElementById('randomize');
var image = w.children; // inner elements, your quotes divs

// a function to hide all divs
var hideDivs = function(divs) {
  for (var div of divs) {
    div.style.display = 'none';
  }
}

hideDivs(image); // hide all initially

// on click
button.addEventListener('click', function(event) {
  var rnd = Math.floor(Math.random() * image.length); // get random index
  hideDivs(image); // hide all quotes
  image[rnd].style.display = 'block'; // show random quote
  event.target.textContent = 'Click one more time!'; // set button text. event.target is the button you've clicked
})

dashboard.html

  <div id="wrapper">
  <div class="image" img scr='../../assets/mood.jpg'></div>
  <div class="image" img scr='../../assets/mood.jpg'></div>
  <div class="image" img scr='../../assets/mood.jpg'></div>
  <div class="image" img scr='../../assets/mood.jpg'></div>
  <div class="image" img scr='../../assets/mood.jpg'></div>
</div>
<button id='randomize'>Next</button>

解决方法:

问题在于目标键入为EventTarget,而图像元素(即HTMLCollection)键入为Element.您要访问的两个属性都在HTMLElement上定义.您可以做的最简单的事情是使用类型断言来告诉编译器,就您而言,这两个实际上都是HTMLElement

// on click
button.addEventListener('click', function (event) {
    var rnd = Math.floor(Math.random() * image.length); // get random index
    hideDivs(image); // hide all quotes

    (image[rnd] as HTMLElement).style.display = 'block'; // show random quote
    (event.target as HTMLElement).textContent = 'Click one more time!'; // set button tqext. event.target is the button you've clicked
})

您可能还希望正确键入hideDivs：

// a function to hide all divs
const hideDivs = function (divs : HTMLCollection) {
    for (var div of divs) {
        (div as HTMLElement).style.display = 'none';
    }
}

标签：angular,typescript,syntax-error,javascript
来源： https://codeday.me/bug/20191109/2011993.html