输入框绑定Enter/Ctrl+Enter键提交

//enter

<input type="text" name="last_input_box"
onkeydown="if(event.keyCode==13)this.form.submit();" />

//ctrl + enter

<input type="text" name="last_input_box"
onkeydown="if(event.ctrlKey && event.keyCode==13)this.form.submit();" />