JS 全选/全不选

function ss(checks){var qx=document.getElementsByName("checkbox");for(var i=0;i<qx.length;i++){qx[i].checked=checks}}function aa(checked){var qx=document.getElementsByName("checkbox");for(var i=0;i<qx.length;i++){if(qx[i].type="checkbox"){qx[i].checked=checked}}}

<form>
  <input name="checkbox" type="checkbox" id="s1" />
  <input name="checkbox" type="checkbox" id="s2" />
  <input name="checkbox" type="checkbox" id="s3" />
</form>
<a href="javascript:ss(true)">全选</a>
<a href="javascript:ss(false)">全不选</a>
<input name="checkbox1" type="checkbox" id="s4" onclick="aa(this.checked)" />全选