JavaScript小數(shù)、整數(shù)四舍五入方法，具體代碼如下：

//保留兩位小數(shù)同時四入五入

function changeTwoDecimal(x) {

var r = "";

var x1 = parseFloat(x);

if (isNaN(x1)) {

r = x.toString();

}

else {

var x2 = Math.round(x1 * 100) / 100;

x1 = (x1 * 1000) / 1000;

if (x2 >= x) r = x2.toString();

else

r = (x2 + 0.01).toString();

}

var p = r.indexOf('.', 0);

if (p == -1)

return r;

else

return r.substring(0, p) + r.substring(p, p + 3);

}

//保留三位小數(shù)同時四入五入

function changeThreeDecimal(x) {

var r = "";

var x1 = parseFloat(x);

if (isNaN(x1)) {

r = x.toString();

}

else {

var x2 = Math.round(x1 * 1000) / 1000;

x1 = Math.round(x1 * 10000) / 10000;

if (x2 >= x1) r = x2.toString();

else

r = (x2 + 0.001).toString();

}

var p = r.indexOf('.', 0);

return r.substring(0, p) + r.substring(p, p + 4);

}

//保留整數(shù)同時四入五入

function changeZeroInt(x) {

var r = "";

var v1 = 0;

r = x.toString();

var p = r.indexOf('.', 0);

if (p != -1)

v1 = r.substring(0, p) * 1;

else

v1 = r * 1;

if (v1 > x)

return v1;

else {

if (p != -1)

return v1 + 1;

else

return v1;

}

}

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