add error handling demo b00tc4mp#51

stuff/js/error-handling.js

@@ -0,0 +1,16 @@
+function logic() {
+    // ...
+    //throw new TypeError('data is not number')
+    throw new SyntaxError('data format is wrong')
+    // ...
+}
+
+try {
+    logic()
+} catch (error) {
+    if (error instanceof TypeError)
+        alert('WARN! type is not correct')
+    else if (error instanceof SyntaxError)
+        alert('FATAL! syntax is not correct')
+
+}