在Java脚本中放置条件

Question

我需要在此代码中添加一个条件：

如果插入的值开头不包含符号#（例如：#stackoverflow），则在提交时将插入#。如果该值类似于#stackoverflow，则无需放置#。

form.on("submit", () => {
  const networkElement = form.closest(".network");
  const channel = form.find("input[name='channel']").val();
  const key = form.find("input[name='key']").val();
  const existingChannel = utils.findCurrentNetworkChan(channel);

  if (existingChannel.length) {
    existingChannel.trigger("click");
  } else {
    socket.emit("input", {
      text: `/join ${channel} ${key}`,
      target: networkElement.find(".lobby").data("id"),
    });
  }

  closeForm(networkElement);

  return false;
});

Answer 1

您可以只检查字符串的第一个字符。假设您正在引用channel变量，则可以执行以下操作：

form.on("submit", () => {
  const networkElement = form.closest(".network");
  const channel = form.find("input[name='channel']").val();
  const key = form.find("input[name='key']").val();
  const existingChannel = utils.findCurrentNetworkChan(channel);

  //Below is the logic to tell if the channel variable doesn't have the # sign in the 
  //beginning

 if (channel.substring(0,1) !== '#') {
    channel = '#' + channel;
 }

 //The code above checks if the first character isn't the # sign and if it isn't,
 //It adds it to the beginning of the string

  if (existingChannel.length) {
      existingChannel.trigger("click");
     } else {
      socket.emit("input", {
      text: `/join ${channel} ${key}`,
      target: networkElement.find(".lobby").data("id"),
    });
   }

 closeForm(networkElement);

 return false;
});