它对我来说在这个 JS Bin 中工作。
<!doctype html>
<html>
<head>
<meta name="description" content="http://stackoverflow.com/questions/37816458">
<meta charset="utf-8">
<base href="http://polygit.org/components/">
<script href="webcomponentsjs/webcomponents-lite.min.js"></script>
<link href="polymer/polymer.html" rel="import">
<link href="iron-label/iron-label.html" rel="import">
<link href="paper-radio-button/paper-radio-button.html" rel="import">
</head>
<body>
<dom-module id="my-el">
<template>
<iron-label>
clicking here should forward tap to paper-radio-button
<paper-radio-button noink iron-label-target on-tap="radioButtonTapped">Radio</paper-radio-button>
</iron-label>
</template>
<script>
Polymer({
is: 'my-el',
radioButtonTapped: function (e) {
console.log('tap');
}
});
</script>
</dom-module>
<my-el></my-el>
</body>
</html>
https://jsbin.com/juzewi/edit?html,控制台,输出