eval
Summary
Evaluates JavaScript code and executes it.
Syntax
eval( codeString )
- codeString
- Required. A String value that contains valid JavaScript code.
Examples
The following code initializes the variable myDate to a test date.
var dateFn = "Date(1971,3,8)";
var myDate;
eval("myDate = new " + dateFn + ";");
document.write(myDate);
// Output: Thu Apr 8 00:00:00 PDT 1971
Remarks
The eval function enables dynamic execution of JavaScript source code.
The codeString string is parsed by the JavaScript parser and executed.
The code passed to the eval function is executed in the same context as the call to the eval function.
Whenever possible, use the JSON.parse function to de-serialize JavaScript Object Notation (JSON) text. The JSON.parse function is more secure and executes faster than the eval function.
See also
Other articles
Attributions
Microsoft Developer Network: Article