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JS calculator code:
<! DOCTYPE html PUBLIC "-// W3C // dtd xhtml 1.0 Transitional // EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <ptml xmlns = "http://www.w3.org/1999/xhtml"> <pead> <meta http-equiv =" content-Type "content =" text/html; charset = gb2312 "/> <title> simple javascript calculator </title> </pead> <body> </ptml>
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Note:
JavaScript eval () function
Definition and usage
The eval () function computes a string and executes the JavaScript code.
Return Value
Returns the string value (if any ).
Description
This method only accepts the original string as the parameter. If the string parameter is not the original string, this method will be returned without any change. Therefore, do not pass a String object as a parameter for the eval () function.
If you try to override the eval attribute or assign the eval () method to another attribute and call it through this attribute, ECMAScript can throw an EvalError exception.
Throw
If the parameter does not contain valid expressions and statements, a SyntaxError exception is thrown.
If eval () is illegally called, an EvalError error is thrown.
If the Javascript code passed to eval () generates an exception, eval () will pass the exception to the caller.
Tips and comments
Tip: Although eval () is very powerful, it is rarely used in actual use.
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