JavaScript's global function

One, eval ()//execute JavaScript code in a string.

Syntax: eval (code); JavaScript can be written in a string to execute.

        var str = "document.write (' Hello! ');"         eval (str);

Second, Evalerror ()

Constructor: New Evalerror ();

New Evalerror (message);

Parstint () parses an integer from a string

        var str = "15avas";        var j = Parstint (str);        Alert (j); Popup 15, the front is not the value can not be parsed, but the value begins to parse  

Iv. parsefloat () parse a value from a string

        var str = "15.1avas";        var i = parsefloat (str);        alert (i); Popup 15.1 Before the value can be resolved if changed to parseint () or output  

V. Isfinite () determine whether a value is infinity

Six, IsNaN () determine whether a value is a non-numeric

JavaScript's global function