fix: 补充缺失的this

pages/webview-screenshot-comparison/webview-screenshot-comparison.uvue

@@ -26,12 +26,12 @@
     },
     methods: {
       appendWebHeadPlaceholder() {
-        if (src.indexOf('pages/template/navbar-lite/navbar-lite') > -1) {
+        if (this.src.indexOf('pages/template/navbar-lite/navbar-lite') > -1) {
           this.webviewContext?.evalJS(`
             const uniNavbar = document.querySelector('.uni-navbar');
             uniNavbar.style.paddingTop = '${state.headerHeight - 44}px';
           `)
-        } else if (src.indexOf('pages/template/scroll-fold-nav/scroll-fold-nav') > -1) {
+        } else if (this.src.indexOf('pages/template/scroll-fold-nav/scroll-fold-nav') > -1) {
           this.webviewContext?.evalJS(`
             const heightSeat = document.querySelector('.height-seat');
             heightSeat.style.height = '125px';