JavaScript 中的 generator.throw() 方法。

generator.throw() 方法用於將錯誤傳遞給 yield。經由 throw 呼叫的生成器會丟擲錯誤並返回包含 done 和 value 屬性的物件，從而恢復執行。

以下是 JavaScript 中 generator.throw() 的程式碼 −

示例

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
<style>
   body {
      font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
   }
   .result,.sample {
      font-size: 18px;
      font-weight: 500;
      color: rebeccapurple;
   }
   .result {
      color: red;
   }
</style>
</head>
<body>
<h1>generator.throw() method in Javascript</h1>
<div class="sample"></div<
<div class="result"></div>
<button class="Btn">Display Num</button>
<button class="Btn">Throw Error</button>
<h3>Click on the above buttons to display num or throw error</h3>
<script>
   let BtnEle = document.querySelectorAll(".Btn");
   let resEle = document.querySelector(".result");
   let sampleEle = document.querySelector(".sample");
   function* increment() {
      let num = 0;
      while (true) {
         try {
            yield num++;
         }
         catch (err) {
            resEle.innerHTML = "Error = " + err + "<br>";
         }
      }
   }
   let inc = increment();
   BtnEle[0].addEventListener("click", () => {
      sampleEle.innerHTML = inc.next().value + " ";
   });
   BtnEle[1].addEventListener("click", () => {
      inc.throw(new Error("Some error occured"));
   });
</script>
</body>
</html>