JS取整,四舍五入,取绝对值等Math对象常用方法

原文:

http://hail812.blog.163.com/blog/static/174581211201212292515749/

<script type="text/javascript">

function f1(type,num1) 
{ 
    switch(type) 
    { 
        case ‘floor‘: 
            return Math.floor(num1);//取整或下舍入 
            break; 
        case ‘round‘: 
            return Math.round(num1);//四舍五入 
            break; 
        case ‘ceil‘: 
            return Math.ceil(num1);//上舍入 
            break; 
        case ‘abs‘: 
            return Math.abs(num1);//取绝对值 
            break; 
    } 
} 
function f2(type,num1,num2,num3) 
{ 
    if(type == ‘max‘){ 
        return Math.max(num1,num2,num3);//返回两个值中最大数 
    }else if(type == ‘min‘){ 
        return Math.min(num1,num2,num3);//返回两个值中最小数 
    } 
}

</script>