选取所有ID以 news 开头的控件
<!DOCTYPE html><html><head><head><script src="http://code.jquery.com/jquery-latest.js"></script><script>$(document).ready(function(){ $("#btn").click(function () { $("[id^='news']").each(function (i) { if (this.tagName.toLowerCase()!= "input") { $(this).html("news here!"); } else { $(this).val("news here!"); } });//$("[id^='news']").each });//$("#btn").click });//$(document).ready</script></head><body><input id="newsletter" value='newsletter' /><input id="milkman" value='milkman' /><input id="newsboy" value='newsboy' /><span id='newspan'>sdfsdf</span><input type='button' id='btn' value='change' /></body></html>