在Javascript中获取字符串中字符之前的文本

function getTextBeforeChar(str, char) {
  const index = str.indexOf(char);
  if (index === -1) return str; // 如果字符不存在，返回原字符串
  return str.substring(0, index);
}

const text = "Hello, World!";
const char = ",";
const result = getTextBeforeChar(text, char);
console.log(result); // 输出: "Hello"

function getTextBeforeChar(str, char) {
  const parts = str.split(char);
  return parts[0];
}

const text = "Hello, World!";
const char = ",";
const result = getTextBefore弧(text, char);
console.log(result); // 输出: "Hello"

function getTextBeforeChar(str, char) {
  const match = str.match(new RegExp(`.*(${char})`));
  return match ? match[0].replace(new RegExp(char, 'g'), '') : str;
}

const text = "Hello, World!";
const char = ",";
const result = getTextBeforeChar(text, char);
console.log(result); // 输出: "Hello"