我发现问题中的错误的另一种方法是替换: document.getElementById('fileInput').files[0]; 和 var input: any = document.getElementById('fileInput'); var file = input.files[0]; 通过将输入定义为“any”类型,Typescript 编译器不再引发错误。 原文由 mutex 发布,翻译遵循 CC BY-SA 3.0 许可协议 ...
exportclassSomeimplementsOnInit{ngOnInit() {// *. 做一次类型转换,或者做类型断言letdom = <HTMLInputElement>document.getElementById('infoArea');letdom1 =document.getElementById('infoArea')asHTMLElement;// 1. 获取输入框中的内容lethtml = dom.innerHTML;letval = dom.value;// 2. 打印输出cons...
然后再document.getElementById("id");获取，然后设置相应属性或样式 方法二： 使用ref,...
(8.1) as //这里获取元素,ts会检测有可能不存在,你可以指定是它一定存在指定类型let div = document.getElementById("div") as HTMLDivElement;//HTMLDivElement; (8.2) <类型>值:这里尖括号<> 不要和泛型搞乱了,泛型是在变量前<>; 断言是对值 重新声明类型,<>在值的前面 1let str = "this is stri...
// 与 iframe 通信获取评论列表高度函数 function getCommentsHeight():void { // 强制设置同源 document.domain = 'ouorz.com' var iframe:any = document.getElementById('article-comments-iframe') var iwindow:any = iframe.contentWindow var idoc:any = iwindow.document iframe.style.height = idoc.body...
TypeScript编译器已经禁止了许多此类操作。然而,有些操作还是有可能绕过编译器的,例如,使用as any转换对象的类型,或者在编译TS代码时关闭严格类型检查的配置,或者在代码中通过@ts-ignore忽略类型检查。 在ArkTS中,严格类型检查不是可配置项。ArkTS强制进行部分严格类型检查,并通过规范禁止使用any类型,禁止在代码中使用...
functionTSButton(){letname:string="Fred";document.getElementById("ts-example").innerHTML = greeter(user); }classStudent { fullName:string;constructor(publicfirstName:string,publicmiddleInitial:string,publiclastName:string) {this.fullName = firstName +" "+ middleInitial +" "+ lastName; } }in...
constel=document.getElementById('status');el.textContent='Ready';// ~~ Object is possibly 'null'if(el){el.textContent='Ready';// OK, null has been excluded}el!.textContent='Ready';// OK, we've asserted that el is non-null
The reason we need to do so in this case is that getElementById's return type is HTMLElement | null. Put simply, getElementById returns null when it can't find an element with a given id. We're assuming that getElementById will actually succeed, so we need to convince TypeScript of...
parentNode as HTMLElement; //don't select text SPAN node var top = parseInt(el.style.top) || 0; var left = parseInt(el.style.left) || 0; this.setState({ isDragging: true, orig: { x: e.pageX - left, y: e.pageY - top} }); } handleDrag(id, height, width, e) { if (...