js to convert numbers into Chinese characters and uppercase numbers, it is recommended to keep them as favorites

function toChineseNum(num){
    
    
    if(!['number','string'].includes(typeof num)) return console.error('类型错误：应为number类型或者string类型');

    var newnum = String(num).match(/[0-9]/ig)
    if(newnum.length > 10) return console.error('位数过大，无法计算');

    var tmpnewchar = ''
    for(var i = 0;i < newnum.length; i++){
    
    
        switch (newnum[i]) {
    
    
            case "0": tmpnewchar += "零";break;
            case "1": tmpnewchar += "一"; break;
            case "2": tmpnewchar += "二"; break;
            case "3": tmpnewchar += "三"; break;
            case "4": tmpnewchar += "四"; break;
            case "5": tmpnewchar += "五"; break;
            case "6": tmpnewchar += "六"; break;
            case "7": tmpnewchar += "七"; break;
            case "8": tmpnewchar += "八"; break;
            case "9": tmpnewchar += "九"; break;
        }
        switch (newnum.length - i - 1) {
    
    
            case 0: tmpnewchar = tmpnewchar; break;
            case 1: if (newnum[i] != 0) tmpnewchar = tmpnewchar + "十"; break;
            case 2: if (newnum[i] != 0) tmpnewchar = tmpnewchar + "百"; break;
            case 3: if (newnum[i] != 0) tmpnewchar = tmpnewchar + "千"; break;
            case 4: tmpnewchar = tmpnewchar + "万"; break;
            case 5: if (newnum[i] != 0) tmpnewchar = tmpnewchar + "十"; break;
            case 6: if (newnum[i] != 0) tmpnewchar = tmpnewchar + "百"; break;
            case 7: if (newnum[i] != 0) tmpnewchar = tmpnewchar + "千"; break;
            case 8: tmpnewchar = tmpnewchar + "亿"; break;
            case 9: tmpnewchar = tmpnewchar + "十"; break;
        }
    }

    while (tmpnewchar.search("零零") != -1 || tmpnewchar.search("零亿") != -1 || tmpnewchar.search("亿万") != -1 || tmpnewchar.search("零万") != -1) {
    
    
        tmpnewchar = tmpnewchar.replace("零亿", "亿");
        tmpnewchar = tmpnewchar.replace("亿万", "亿");
        tmpnewchar = tmpnewchar.replace("零万", "万");
        tmpnewchar = tmpnewchar.replace("零零", "零");      
    }

    if (tmpnewchar.indexOf("一十") == 0) {
    
    
        tmpnewchar = tmpnewchar.substr(1);
    }

    if (tmpnewchar.lastIndexOf("零") == tmpnewchar.length - 1) {
    
    
        tmpnewchar = tmpnewchar.substr(0, tmpnewchar.length - 1);
    }
    return tmpnewchar
}