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Implement multiple selection and inverse selection of check boxes in js

一个新手Original: 2017-10-07 11:40:491914browse

<!DOCTYPE html><html>
    <head>
        <meta charset="UTF-8">
        <title></title>
        <script>

            window.onload = function(){
                selAll = document.getElementById("selAll");
                hobbys = document.getElementsByName("hobby");
                fx = document.getElementById("fx");                //全选事件
                selAll.onclick = function(){
                    //全选
                    if(selAll.checked == true){                        
                    for (var i=0;i<hobbys.length;i++) {
                            hobbys[i].checked = true;
                        }
                    }else{                       
                    for (var i=0;i<hobbys.length;i++) {

                            hobbys[i].checked = false;
                        }
                    }
                }                //反选
                fx.onclick = function(){

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

            }        </script>
    </head>
    <body>
        <input type="checkbox" name="" id="selAll" />全选        
        <button id="fx">反选</button>
        <br>
        <input type="checkbox" name="hobby" />篮球        
        <input type="checkbox" name="hobby" />足球        <input type="checkbox" name="hobby" />乒乓球        <input type="checkbox" name="hobby" />羽毛球    </body></html>

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Implement multiple selection and inverse selection of check boxes in js

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