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>