我正在阅读 Google Analytics API 文档并注意到我以前从未见过/使用过的语法:
<script>
<?php
<<<HTML
cxApi.setChosenVariation(
$chosenVariation, // The index of the variation shown to the visitor
$experimentId // The id of the experiment the user has been exposed to
);
HTML;
?>
</script>
做什么<<<HTML
,这叫什么?