How to convert a string (with leading zero or not) to an integer?

How to convert a string (with leading zero or not) to an integer? For example,开发者_C百科 '08' to 8.

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There are several ways to convert a string to a number, I prefer to use the unary + operator:

var number = +"08"; // 8

This is the equivalent of writing:

var number = Number("08"); // 8

Unlike parseInt(), when using + or Number() no radix is necessary because the internal number conversion will not parse octal numbers. If you want the parseInt() or parseFloat() methods, it's also pretty simple:

var number = parseInt("08", 10); // 8

parseInt and parseFloat are less reliable for user input because an invalid numeric literal might be considered salvageable by these functions and return an unexpected result. Consider the following:

parseInt("1,000");   // -> 1, not 1000
+"1,000";            // -> NaN, easier to detect when there's a problem

Extra Reading

• Number() - MDC
• Converting to number (JavaScript Type-Conversion) - jibbering.com

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Use parseInt() with the radix argument. This disables autodetection of the base (leading 0 -> octal, leading 0x -> hex):

var number = parseInt('08', 10);
// number is now 8

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you can use parseInt(); with base 10 or parseFloat(); to parse float

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Use the parseInt function. Reference: link