How jquery determines the size of two values

This article mainly share with you how jquery determines the size of two values, mainly in the form of code and we share, hope to help everyone.

$a = ten; $b = 2;if ($a < $b) {echo  "B is greater than a";} Else{echo "A greater than B"};

In JS, VAR defines variables and generates strings.

var a = 10;var B = 2;if (A < b) {alert ("error");} Else{alert ("normal");};

The running result is normal; 10 is less than 2 normal. Obviously, this is not the result we want. Why? Because Two is a string, take the first bit of a 1, take the first bit of B 2; Obviously, 2 is greater than 1. Then return to normal.

Workaround:

One, eval () function

if (eval (a) <eval (b)) {//Logical business} The   eval () function is used to calculate a code string without referencing any particular object.

Second, parseint () function

The IF (parseint (a) <parseint (b)) {//Logical business}   parseint () function is used in converting to int.

Multiplication operation (disguised conversion type) (primary school sports teacher once said: Both sides multiplied by the same number, the equation does not change)

if (a *10 < b * 10) {//Logic business}