假设我正在编写以下 Web 组件或自定义元素:
<!doctype html>
<html>
<head>
<script src="js/MutationObserver.js"></script>
<script src="js/CustomElements.js"></script>
<script>
var proto = Object.create(HTMLElement.prototype);
proto.createdCallback = function() { console.log('created');};
proto.enteredViewCallback = function() {};
document.register('x-foo', {prototype: proto});
document.createElement('x-foo');
</script>
</head>
<body>
</body>
</html>
(github上的polyfill)这适用于Chrome。但是当我尝试在 PhantomJS 中运行它时,我收到以下错误:
TypeError: instanceof called on an object with an invalid prototype property.
http://localhost/~me/js/CustomElements.js:18
http://localhost/~me/js/CustomElements.js:217 in instantiate
http://localhost/~me/js/CustomElements.js:333
http://localhost/~me/js/CustomElements.js:342 in createElement
...
如果你想重现,这里是我的 phantomjs 脚本
var page = require('webpage').create();
page.open('http://localhost/~me/test.html', function() {
phantom.exit();
});
我尝试过其他 polyfill,例如
但实际上他们都没有工作。任何想法如何解决这一问题 ?