js实现表单checkbox的单选，全选

全选&单选

    //<input type="checkbox" name="" class="quan" value="" />全选
    //<input type="checkbox" name="" class="dan" value="" />单选
    //<input type="checkbox" name="" class="dan" value="" />单选
    //<input type="checkbox" name="" class="dan" value="" />单选
    //<input type="checkbox" name="" class="dan" value="" />单选
    //<input type="checkbox" name="" class="quan" value="" />全选
    
    <script src="js/jquery-1.11.3.js" type="text/javascript" charset="utf-8"></script>
    <script type="text/javascript"> 
        var $checke_q = $(".quan"); //全选按钮
        var $checke_d = $(".dan"); //单选按钮

        $checke_q.click(function() {
            var that = this;
            $checke_d.each(function() { //所有的单选按钮跟随选中的多选按钮变化
                this.checked = that.checked;
            })
            $checke_q.each(function(){  //所有的多选按钮跟随选中的多选按钮变化
                this.checked=that.checked;
            })
        })
        $checke_d.change(function() {
            let count = 0; //单选 按钮 个数
            $checke_d.each(function() { 
                if(this.checked) {
                    count ++;
                }
            })
            if(count == $checke_d.length) {   //当count等于单选按钮的个数时 说明单选按钮全部选中了，此时多选按钮也该被选中
                $checke_q.each(function() {
                    this.checked = true;
                })
            } else {
                $checke_q.each(function() {
                    this.checked = false;
                })
            }
        })
    </script>