1  <HTML>
  2  <HEAD>
  3  <TITLE>JavaScript Example:  eval() method</TITLE> 
  4  
  5  <SCRIPT LANGUAGE="JavaScript">
  6  <!-- hide script from old browsers
  7  
  8  function compute(form) { 
  9    with (Math) {
 10      form.result.value = eval(form.expr.value);
 11    }
 12    form.expr.select();
 13  }
 14  
 15  // end script hiding -->
 16  </SCRIPT>
 17  
 18  </HEAD> 
 19  
 20  <BODY BGCOLOR="#FFFFFF" 
 21        onLoad="document.forms[0].expr.select();
 22                document.forms[0].expr.focus()">
 23  
 24  <FORM>
 25  
 26  Enter an expression: <BR>
 27  <INPUT TYPE="text" NAME="expr" SIZE=20
 28         VALUE="1/sqrt(2*PI)">
 29  <INPUT TYPE="button" VALUE="Evaluate" 
 30         onClick="compute(this.form)">
 31  <P>
 32  Result: <BR> 
 33  <INPUT TYPE="text" NAME="result" SIZE=20> 
 34  
 35  </FORM>
 36  
 37  </BODY>
 38  </HTML>