试图让jQuery检测输入输入，但是检测到空格和其他键，则不会检测到输入。下面有什么问题：
$("#entersomething").keyup(function(e) {
alert("up");
var code = (e.keyCode ? e.keyCode : e.which);
if (code==13) {
e.preventDefault();
}
if (code == 32 || code == 13 || code == 188 || code == 186) {
$("#displaysomething").html($(this).val());
});
<input id="entersomething" />
<div id="displaysomething"></div>
解决方法
JavaScript / jQuery
$("#entersomething").keyup(function(e){
var code = e.which; // recommended to use e.which,it's normalized across browsers
if(code==13)e.preventDefault();
if(code==32||code==13||code==188||code==186){
$("#displaysomething").html($(this).val());
} // missing closing if brace
});
HTML
<input id="entersomething" type="text" /> <!-- put a type attribute in --> <div id="displaysomething"></div>
