javascript - 搜索字符串以查找 JavaScript 中的所有字母

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我在文本中搜索单词“i”，但它只显示第一个“i”，不显示其余的“i”
我想让你给我看全文
请帮帮我

const searchItem = () => {
  const source = "Lorem ipsum dolor sit amet consectetur adipisicing elit."
  const searchDate = "i";
  for (let i = 0; i < source.length; i++) {
    let res = source.search(searchDate);
    if (res > 0) {
      document.getElementById("demo").innerHTML = res;
    } else if (res < 0) {
      document.getElementById("demo").innerHTML = "No results found";
    }
  }
}

<button onclick="searchItem()">Try it</button>

<p id="demo"></p>

Answer 1

您可以使用String#indexOf使用 fromIndex 参数连续搜索字符串。

const searchItem = () => {
  const source = "Lorem ipsum dolor sit amet consectetur adipisicing elit."
  const searchDate = "i";
  const indexes = [];
  let i, prev = 0;
  while((i = source.indexOf(searchDate, prev)) !== -1){
    indexes.push(i);
    prev = i + searchDate.length;
  }
  if (indexes.length > 0) {
    document.getElementById("demo").innerHTML = indexes;
  } else {
    document.getElementById("demo").innerHTML = "No results found";
  }
}

<button onclick="searchItem()">Try it</button>

<p id="demo"></p>