polyfill for IE 11

redcapuzgent · Jan 15, 2020 · 799bca5 · 799bca5
1 parent 392872c
commit 799bca5
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/imagemapfunctions.js b/imagemapfunctions.js
@@ -4,6 +4,13 @@ String.prototype.endsWith = function(suffix) {
     return this.indexOf(suffix, this.length - suffix.length) !== -1;
 };
 
+if (!String.prototype.startsWith) {
+    String.prototype.startsWith = function(searchString, position) {
+        position = position || 0;
+        return this.indexOf(searchString, position) === position;
+    };
+}
+
 // Production steps of ECMA-262, Edition 6, 22.1.2.1
 if (!Array.from) {
   Array.from = (function () {