javascript - The Mathematical Operators not working on window.innerWidth -

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when use mathematical operators window.innerwidth returs nan.

i tried add numeric 1 window.innerwidth.
what's wrong code? 

  <body>    <p>click button display window's height , width (not including toolbars , scrollbars).</p>  <button onclick="myfunction()">try it</button>  <p id="demo"></p>  <script> function myfunction() {     var w = window.innerwidth;     var h = window.innerheight;     x = document.getelementbyid("demo");     x.innerhtml = "width: " + w-1 + " heigth: " + h; } </script>   </body>

view sample @ plunker

change innerhtml code as

x.innerhtml = "width: " + (w-1) + " heigth: " + h;

modify javascript code below

here modified plunker

function myfunction() {     var w = window.innerwidth;     var h = window.innerheight;     x = document.getelementbyid("demo");     x.innerhtml = "width: " + (w-1) + " heigth: " + h; }

stackoverflow reference '+' operator


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