How to round float numbers in javascript?

Float value rounded number

javascript "toFixed()" predefined function  using

(6.688689).toFixed(); // equal to 7
(6.688689).toFixed(1); // equal to 6.7
(6.688689).toFixed(2); // equal to 6.69

MDN using rounded value

Math.round10(5.25, 0);  // 5
Math.round10(5.25, -1); // 5.3
Math.round10(5.25, -2); // 5.25
Math.round10(5, 0);     // 5
Math.round10(5, -1);    // 5
Math.round10(5, -2);    // 5

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How can I calculate the distance between two 3D positions?

3D two point distance calculation try to best from side 

function dist(x0,y0,z0,x1,y1,z1){

deltaX = x1 - x0;
deltaY = y1 - y0;
deltaZ = z1 - z0;

distance = Math.sqrt(deltaX * deltaX + deltaY * deltaY + deltaZ * deltaZ);

return distance;
}

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