问删除查询字符串"?“在HTML表单中，方法GET

EN

<input type="radio" id="google" name="image" onclick="googleImages();" checked/>
<label for="google">Google Images</label>

<input type="radio" id="unsplash" name="image" onclick="unsplash();"/>
<label for="unsplash">Unsplash</label>

<form id="form" method="GET" action="https://www.google.com/search?q=">
    <input id="input" type="text" name="q" value="" required>
    <input type="submit" value="Search" onclick="this.form.target='_blank';">
    <input id="helper" type="hidden" name="tbm" value="isch">
</form>

var
  form = document.getElementById("form"),
  input = document.getElementById("input"),
  helper = document.getElementById("helper");

function googleImages() {
  form.action="https://www.google.com/search?q=";
  input.name="q";
  helper.name="tbm";
  helper.value="isch";
}
function unsplash() {
  form.action="https://unsplash.com/search/photos/";
  input.name="";
  helper.name="";
  helper.value="";
}