当我添加.sqrt（）时，为什么我的jQuery无法正常工作

Question

I am trying to create a grid of divs and need to take the square root of the users input to find the height and width needed to make a square. This is the code I have doing it:

$('#size').click(function(){
 $('.container').empty();
 var big = prompt('Enter the desired number of cubes');
 var final = $(big).sqrt();
 drawGrid(final);

Here is a link to my whole project on jsfiddle: https://jsfiddle.net/ztwsptys/ Any help would be appreciated.

Answer 1

Just do Math.sqrt(big) . Assuming that you are sure that big is a Number . You don't need to go crazy with wrapping your big variable with jQuery. Make sure that big is actually a number. If you read the user input I can bet that the value is read as a string. You would need to ParseFloat or ParseInt it depending what kind of value you are expecting from the user.

Answer 2

Use Math.sqrt(big); instead of $(big).sqrt();