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JS 参考手册
DOM Element closest() 方法
tryjsref_element_closest
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<!DOCTYPE html> <html> <head> <style> .container, .demo { background-color: tomato; color: white; padding: 20px; margin: 10px; } </style> </head> <body> <div class="demo"> Grandparent <div class="demo container">Parent <div id="myElement" class="demo">The parent of this div element will be selected.</div> </div> </div> <script> var element = document.getElementById("myElement"); var closest = element.closest(".container"); if (closest) { closest.style.border = "10px solid yellow"; } </script> </body> </html>