javascript - HTML Alert usage issue -


hello having current problem of webpage not loading 2 alert dialog boxes, when comment out second box , line of code webpage works adding second box causes whole page not work.

<!doctype html> <!--jason guerrier 2-7-16-->  <html>         <head>                 <title> jason guerrier </title>         </head>         <body>                 <script>                         var userage = 0;                         var value1 = 0;                         var value2 = 0;                         var add = 0;                         var sub = 0;                         var mul = 0;                         var div = 0;                         var mod = 0;                          var equ;                         var notequ;                         var gretha;                         var grethanequ;                         var lestha;                         var lesthaequ;                         var equequ;                         var notequequ;                          userage = prompt("enter age.");                         if(userage >= 18)                             {                                 alert("you old enough vote");                             }                         else                             {                                 alert("unfortunately not old enough vote");                             }                          value1 = prompt("enter whole number");                         value2 = prompt("enter second whole number");                          add = parsefloat(value1) + parsefloat(value2);                         sub = value1 - value2;                         mul = value1 * value2;                         div = value1 / value2;                         mod = value1 % value2;                          alert("result of value 1 + value 2 = " + add +                          '\n' + "result of value 1 - value 2 = " + sub + '\n'                         + "result of value 1 * value 2 = " + mul + '\n' +                         "result of value 1 / value 2 = " + div + '\n' +                          "result of value 1 % value 2 = " + mod);                          equ = value1 == value2;                         notequ = value1 != value2;                         gretha = value1 > value2;                         grethanequ = value1 >= value2;                         lestha = value1 < value2;                         lesthaequ = value1 <= value2;                         equequ = value1 === value2;                         notequequ = value1 !== value2;                          alert("result of value 1 == value 2 = " + equ +                          '\n' + "result of value 1 != value 2 = " + notequ + '\n'                         + "result of value 1 > value 2 = " + gretha + '\n' +                         "result of value 1 >= value 2 = " + grethanequ + '\n' +                          "result of value 1 < value 2 = " + lestha + '\n'                         "result of value 1 <= value 2 = " + lesthaequ + '\n' +                          "result of value 1 === value 2 = " + equequ + '\n' +                           "result of value 1 !== value 2 = " + notequequ);                  </script>         </body> </html>

the error getting is:

uncaught syntaxerror: missing ) after argument list

because missing + operator:

before:

alert("result of value 1 == value 2 = " + equ + '\n' + "result of value 1 != value 2 = " + notequ + '\n' + "result of value 1 > value 2 = " + gretha + '\n' + "result of value 1 >= value 2 = " + grethanequ + '\n' + "result of value 1 < value 2 = " + lestha + '\n' // missing operator here "result of value 1 <= value 2 = " + lesthaequ + '\n' + "result of value 1 === value 2 = " + equequ + '\n' + "result of value 1 !== value 2 = " + notequequ);

after:

alert("result of value 1 == value 2 = " + equ + '\n' + "result of value 1 != value 2 = " + notequ + '\n' + "result of value 1 > value 2 = " + gretha + '\n' + "result of value 1 >= value 2 = " + grethanequ + '\n' + "result of value 1 < value 2 = " + lestha + '\n' + // fixed! "result of value 1 <= value 2 = " + lesthaequ + '\n' + "result of value 1 === value 2 = " + equequ + '\n' + "result of value 1 !== value 2 = " + notequequ);

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