有没有办法获取网页中每个元素的每个id

Question

<script type="text/javascript">
    function display(id) { 
      $("html *").attr('id')
      var sub=id.substring(0,1);

      if(sub) {
        document.getElementById(id).style.visibility="visible";

      } else {
        document.getElementById(id).style.visibility="hidden";
      }
    }
</script>

Answer 1

使用jQuery，选择具有属性id的元素，并使用each方法对其进行迭代。例如：

$('[id]').each(function() {
  console.log(this.getAttribute('id'));
});

Answer 2

    function check(id)
    {   
        var s = id.substring(0,1);
        var tableCells = document.getElementsByTagName('td'),
        cellCount = tableCells.length,i;
        for (i = 0; i < cellCount; i += 1) {
                var sub = tableCells.substring(0,1);
                if(strcmp(s,sub))  {
                             document.getElementById(id).style.visibility="visible";
}
else  {
        document.getElementById(id).style.visibility="hidden";

}
          }
    }   

Answer 3

功能检查（id） {
    var sub = id.substring（0,1）;

IOBase

}