JS eval () function

Jseval () function
This function can treat a string as aJavascriptExpression to execute it.
For a small example:
//Executing an expression
var the_unevaled_answer = "2 + 3";
var the_evaled_answer = eval ("2 + 3");
Alert ("The un-evaled answer is" + The_unevaled_answer + "and the evaled answer are" + the_evaled_answer);

If you run this sectionEvalProgram,You will see inJavascriptString in"2 + 3"was actually carried out.
So when you putThe_evaled_answerValue is set toEval ("2 + 3")WhenJavascriptWill understand and put23the_evaled_ Answer
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  reference article http:/ blog.csdn.net/huangboxi/article/details/4983828