js实现全选与全部取消功能

function checkAll() {
 //把所有参与选择的checkbox使用相同的name，这里为"num_iid"
    var eles = document.getElementsByName("num_iid");
    var i = 0;
 // 如果是全选状态，则取消所有的选择
    if (isSelectAll() == true) {
  for ( i = 0; i < eles.length; i++) {
   eles[i].checked = false;
        }
        document.getElementById("selectAll").checked = false;
    } else {
  // 否则选中每一个checkbox
        for ( i = 0; i < eles.length; i++) {
            eles[i].checked = true;
        }
    }
}
// 判断当前是否为全选状态
function isSelectAll() {
    var isSelected = true;
    var eles = document.getElementsByName("num_iid");
    for (var i = 0; i < eles.length; i++) {
  if (eles[i].checked != true) {
   isSelected = false;
        }
    }
    return isSelected;
}
// 选择任意一个非全选checkbox
function checkOne() {
    if (isSelectAll()) {
  document.getElementById("selectAll").checked = true;
    } else {
  document.getElementById("selectAll").checked = false;
 }
}

转载于:https://www.cnblogs.com/hclw/p/4341806.html