[refactor]: check for the ispc-html class is done using a regular expression to ensure that the class is only added once when the browser window is resized (#301)

web/src/render/index.html

@@ -15,8 +15,10 @@
 
           if (!/Android|webOS|iPhone|iPad|iPod|BlackBerry/i.test(navigator.userAgent)) {
             width = width < PC_W ? width : PC_W
+            if (!docEl.className.includes('ispc-html')) {
               docEl.className += ' ispc-html'
             }
+          }
 
           var f = Math.min(width / 7.5, 50)
           docEl.style.fontSize = f + 'px'