js 全选/取消

平时常用一个小功能

var check_all = document.getElementsByName('student_box');
var check_flag = true;
function checkAll(_this){
    check_flag = !check_flag;
    _this.checked = check_flag;

    if(_this.checked){
        for(var i = 0;i<check_all.length;i++){
           check_all[i].checked=false;
        }
    }else{
       for(var i = 0;i<check_all.length;i++){
           check_all[i].checked=true;
        } 
    } 
    
}

<input type="checkbox" name="student_box" id="check_all" onclick="checkAll(this)" />

<input type="checkbox" name="student_box" />

 

转载于:https://www.cnblogs.com/pangzi666/p/6066324.html