基于JQ的三级联动菜单选择

<!-- author：青芒 -->

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>三级联动菜单</title>

</head>

<body>

    <select class="one">

        <option value="请选择">请选择</option>

    </select>

    <select class="two">

        <option value="请选择">请选择</option>

    </select>

    <select class="three">

        <option value="请选择">请选择</option>

    </select>

    <script src="http://code.jquery.com/jquery-2.1.1.min.js"></script>

    <script>

        $(function(){

            var oneArr = ["1","2","3"]; //数组1

            var twoArr = [ //数组2

                ["1-1","1-2","1-3"],

                ["2-1","2-2","2-3"],

                ["3-1","3-2","3-3"]

            ];

            var threeArr = [ //数组3

                [

                    ["1-1-1","1-1-2","1-1-3"],["1-2-1","1-2-2","1-2-3"],["1-3-1","1-3-2","1-3-3"]

                ],

                [

                    ["2-1-1","2-1-2","2-1-3"],["2-2-1","2-2-2","2-2-3"],["2-3-1","2-3-2","2-3-3"]

                ],

                [

                    ["3-1-1","3-1-2","3-1-3"],["3-2-1","3-2-2","3-2-3"],["3-3-1","3-3-2","3-3-3"]

                ]

            ];

            let oneHtml = '<option value="请选择">请选择</option>';

            for(let i in oneArr){

                i = Number(i);

                oneHtml += '<option value="'+ i +'">'+ oneArr[i] +'</option>';

            }

            $(".one").html(oneHtml);

            $(".one").change(function(){ //下拉框1选择事件

                if($(this).val() == "请选择"){ //下拉框1如果点击了请选择，则2,3都内容都重置成“请选择”

                    $(".two, .three").html('<option value="请选择">请选择</option>');

                    return;

                }

                let thisVal = Number($(this).val());

                let twoHtml = '';

                for(let j in twoArr[thisVal]){

                    j = Number(j);

                    twoHtml += '<option value="'+ (j+1) +'">'+ twoArr[thisVal][j] +'</option>';

                }

                $(".two").html(twoHtml);

                let threeHtml = '';

                for(let k in threeArr[thisVal][0]){

                    k = Number(k);

                    threeHtml += '<option value="'+ (k+1) +'">'+ threeArr[thisVal][0][k] +'</option>';

                }

                $(".three").html(threeHtml);

            });

            $(".two").change(function(){ //下拉框2选择事件

                let oneVal = Number($(".one").val());

                let thisVal = Number($(this).val()) - 1;

                let threeHtml = '';

                for(let x in threeArr[oneVal][thisVal]){

                    threeHtml += '<option value="'+ (x+1) +'">'+ threeArr[oneVal][thisVal][x] +'</option>';

                }

                $(".three").html(threeHtml);

            });

        })

    </script>

</body>

</html>
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