js获取number的长度

function getNumberLength(num) {
    // 处理负数和0的情况
    num = Math.abs(num);
    return num.toString().length;
}

console.log(getNumberLength(12345)); // 输出: 5
console.log(getNumberLength(-6789)); // 输出: 4
console.log(getNumberLength(0));     // 输出: 1

function getDecimalPlaces(num) {
    const numStr = num.toString();
    const decimalIndex = numStr.indexOf('.');
    
    if (decimalIndex === -1) {
        return 0; // 没有小数部分
    }
    
    return numStr.length - decimalIndex - 1;
}

console.log(getDecimalPlaces(123.456)); // 输出: 3
console.log(getDecimalPlaces(-0.789));  // 输出: 3
console.log(getDecimalPlaces(100));     // 输出: 0

function getNumberCharLength(num) {
    return num.toString().length;
}

console.log(getNumberCharLength(-123.45)); // 输出: 7
console.log(getNumberCharLength(67890));   // 输出: 5