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This article mainly introduces what are the system functions in JavaScript. It is very detailed and has certain reference value. Friends who are interested must finish reading it.

1.encodeURI ("); returns an encoded result of the URI string:

Var urlStr=encodeURI ("http://www.baidu.com?country= China & name=l f")

Alert (urlStr)

2.decodeURI ("); decodes an encoded URI string to the original string and returns:

Var urlStr=decodeURI ("http://www.baidu.com?country=%E4%B8%AD%E5%9B%BD&name=%20 f")

Alert (urlStr)

3.parseInt (numString, [radix]); converts the specified string to an integer. If no second parameter is specified, the string with the prefix "0x" is treated as hexadecimal, the string with the prefix "0" as octal, and everything else as decimal:

4.parseFloat (); converts a string to the corresponding decimal

5.isNaN (); determine whether a variable is a number

6.escape (); returns the result string encoded with a string

7.unescape (); decode the escape-encoded string to its initial value

8.eval (); executes the parameter string as a javascript expression

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