2024 IT鐵人賽 Day30 -字串處理

#javascript javascript 30

will93068 2024-10-27 19:39:41 ‧ 340 瀏覽

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trim 處理字串前後空格

slice取特定範圍字串

indexOf 查找字串位置

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>字串處理</title>
  </head>
  <body>
    <input type="email" value="123456789@gmail.com" class="emailInput" />

    <button class="submit">送出</button>

    <script>
      const emailInput = document.querySelector(".emailInput");

      console.log(emailInput);

      const submit = document.querySelector(".submit");

      console.log(submit);

      submit.addEventListener("click", () => {
        const Textrim = emailInput.value.trim();
        const TextNotrim = emailInput.value;
        console.log("處理前後字串空格",Textrim); // 處理前後字串空格
        console.log("沒有處理前後字串空格",TextNotrim); // 沒有處理前後字串空格

        const SliceText = emailInput.value.slice(0, 5); // 處理起始0 - 5位置的字串
        const SliceText2 = emailInput.value.slice(3); // 處理起始3位置的字串
        console.log("slice 0-5位置",SliceText);
        console.log("slice 0-5位置",SliceText2);

        const index = emailInput.value.indexOf("@");
        console.log("查找@置",index);
        
      });
    </script>
  </body>
</html>