javascript - 当我尝试将 typescript 代码编译为javascript时，得到**类型 'NodeListOf'不是数组类型或字符串类型**

Question

当我尝试将 typescript 代码编译为 JavaScript 时，得到类型“NodeListOf”不是数组类型或字符串类型。

if (query.length) {                                              
  var regex = new RegExp("(" + query + ")", "gm"); 
  var li = document.querySelectorAll("#id li"); //error                 
    for (var Element of li){                                   
      Element.innerHTML = Element.innerHTML.replace(regex, '<span class="classname">$1</span>'); 
    }
  }
}

Answer 1

下面的代码可以正常编译，并且我已经添加了内联注释。

let query = '';
if (query.length) {
    var pattern = new RegExp("(" + query + ")", "gim");
    var li: NodeListOf<Element> = document.querySelectorAll("#test li");
    // ES5 does not allow TS iteration of NodeListOf<Element> nor use of Array.from 
    // so it is necessary to loop over it manually.
    // Note that Element is an existing type which caused a conflict with "(var Element of list)".
    // It was necessary to rename Element to element.
    for (let i = 0; i < li.length; i++) {
        let element = li[i];
        element.innerHTML = element.innerHTML.replace(pattern, '<span class="target">$1</span>');
    }
}