javascript通用参数判断

//判断value是小于等于max的数字
function isNumberMax(value,
max){
    if(!isNumber(value) ||
!isNumber(max)){
        return
false;
    }
    if(parseInt(value) <=
max){
        return
true;
    }
    return false;
}

//判断value是大于等于min的数字

function isNumberMin(value, min){
    if(!isNumber(value)
|| !isNumber(min)){
        return
false;
    }
    if(parseInt(value) >=
min){
        return
true;
    }
    return false;
};

//判断value是否是数字

function isNumber(value) {
    if(value === "" || value ===
null)
        return
false;
    if (typeof value === ‘number‘)
{
        return
true;
    };
    return
!isNaN(value);
};

console.log(1,isNumber(111));

console.log(2,isNumber("111"));

console.log(3,isNumber(0));

console.log(4,isNumber("0"));

console.log(5,isNumber(null));

console.log(6,isNumber({}));

console.log(7,isNumber("ssdsd"));

console.log(8,isNumber(undefined));

console.log(9,isNumber());

console.log(10,isNumber(""));

console.log(11,isNumber("-1"));

console.log(12,isNumberMin(1,"-1"));

console.log(13,isNumberMax(1,9));

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