如何在javascript中將整數(shù)顯示為十分之一

Math.round(3.14159 * 100) / 100  // 3.14
3.14159.toFixed(2);              // 3.14 returns a string
parseFloat(3.14159.toFixed(2));  // 3.14 returns a number
Math.round(3.14159)  // 3
Math.round(3.5)      // 4
Math.floor(3.8)      // 3
Math.ceil(3.2)       // 4

js四舍五入

//There are meny ways of rounding...
Math.floor(5.5) //Answer 5, it alwas rounds down.
Math.round(5.5) //Answer 6, it simpily rounds to the closest whole number.
Math.ceil(5.5) //Answer 6, it alwas rounds up.
//You can do more things too...
Math.floor(5.57 * 10) / 10 //Answer 5.5, the number turns into 55.7, Then gets floored (55.0), Then gets divied, (5.5).

四舍五入 javascript

Math.round(3.14159)  // 3
Math.round(3.5)      // 4
Math.floor(3.8)      // 3
Math.ceil(3.2)       // 4

Javascript 整數(shù)到最接近的 5

function round5(x)
{
    return Math.ceil(x/5)*5;
}

javascript四舍五入到最接近的10

var rounded = Math.round(number / 10) * 10

四舍五入數(shù)字打字稿

var n = 4.3;
alert(Math.ceil(n)); //alerts 5