原生js数字转化为大写汉字

<input type="number" id="input">
<input type="submit" onclick="init()">
<p id="txt"></p>
<script>
var init = (function() {
    var fn6 = function() {
        var val = document.getElementById('input').value,
            txt = document.getElementById('txt');
        var txt1 = fn1(val)
        console.log(txt1)
        txt.innerText = txt1

}
    var fn1 = function(str) {
        var arr = '';
        str = String(str);
        for (let i = 0; i < str.length; i++) {
            arr += fn2(str[i]);
        }
        if (arr.length == 5) {
            return arr[0] + '孺' + arr[1] + '仟' + arr[2] + '佰' + arr[3] + '拾' + arr[4]
        }
        if (arr.length == 4) {
            return arr = arr[0] + '仟' + arr[1] + '佰' + arr[2] + '拾' + arr[3]
        }
        if (arr.length == 3) {
            return arr = arr[0] + '佰' + arr[1] + '拾' + arr[2]
        }
        if (arr.length == 2) {
            return arr = arr[0] + '拾' + arr[1]
        }
        if (arr.length == 1) {
            return arr = arr[0]
        }
        arr = fn3(arr);
        arr = fn4(arr);
        arr = fn5(arr);

return arr;
    }
    var fn5 = function(arr) {
        var reg = new RegExp('零', 'g')
        var a = arr.replace(reg, '')
        return a
    }
    var fn4 = function(arr) {
        str1 = arr.substring(0, arr.length - 7);
        console.log(str1.length)
        if (str1.length == 5) {
            str1 = str1[0] + '仟' + str1[1] + '佰' + str1[2] + '拾' + str1[3]
        }
        if (str1.length == 4) {
            str1 = str1[0] + '佰' + str1[1] + '拾' + str1[2]
        }
        if (str1.length == 3) {
            str1 = str1[0] + '拾' + str1[1]
        }
        str2 = arr.substring(arr.length - 7, arr.length)
        return str1 + '孺' + str2

}
    var fn3 = function(arr) {

if (arr.length == 6) {
            return arr[0] + arr[1] + '孺' + arr[2] + '仟' + arr[3] + '佰' + arr[4] + '拾' + arr[5]
        }
        if (arr.length == 7) {
            return arr[0] + arr[1] + arr[2] + '孺' + arr[3] + '仟' + arr[4] + '佰' + arr[5] + '拾' + arr[6]
        }
        if (arr.length == 8) {
            return arr[0] + arr[1] + arr[2] + arr[3] + '孺' + arr[4] + '仟' + arr[5] + '佰' + arr[6] + '拾' + arr[7]
        }
    }
    var fn2 = function(a) {
        switch (a) {
            case '0':
                return '零';
            case '1':
                return '壹';
            case '2':
                return '贰';
            case '3':
                return '叁';
            case '4':
                return '肆';
            case '5':
                return '伍';
            case '6':
                return '陆';
            case '7':
                return '柒';
            case '8':
                return '扒';
            case '9':
                return '玖';

}
    }
    return function() {
        fn6()
    }

})()
</script>

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