为什么我的会话值更改为特定值？

Question

Can someone help understand why my session value changed for a particular value, 03375?

My MVC controller code:

Session["something"] = "03375";

My view js code:

$(function(){
 alert(@Session["something"].ToString()); 
});

Result: js alerts 1789. Why???

It works for other values except. Here is a fiddle https://dotnetfiddle.net/zLdyO8

Answer 1

This has nothing to do with asp.net session. If you do this in your page

console.log(03375);

You will get 1789

Why is this happening ?

Because when browser's javascript runtime sees a number starting with 0 prefix, it thinks it is octal representation of the number. In fact 03375 is the octal equivalent of 1789 . So your browser is basically converting the octal value to it's decimal equivalent and giving you 1789 ( browsers usually parse the number to decimal representation )

From mdn ,

Note that decimal literals can start with a zero (0) followed by another decimal digit, but if every digit after the leading 0 is smaller than 8, the number gets parsed as an octal number.

This means, if you are trying

console.log(09375);

It will print, 9375 !!!

To handle your case, the ideal solution is to set the correct type value. For example, if you are passing a numeric value, simply set the numeric value instead of the string version with leading zero..

Session["something"] = "3375";

Or even better

Session["something"] = 3375;

Then in the client side,

alert(@Session["something"]);

If you absolutely want to keep the 0 prefix, while setting the session value, but you want the value as number at client side, you can read it in a string and then use parseInt to convert it to a number type

var r = '@Session["something"].ToString()';
alert(r);  // the string with leading 0
var n = parseInt(r);
alert(n);  // the number
alert(typeof(n));