下面这段js表单提交代码，把return改成returnfalse有什么区别？高手讲一下啊~~~functioncheck(){varnewPwd=$("#newPwd").val()varcfmPwd=$("#cfmPwd").val()if(newPwd==''){alert('Pleaseinputnewpassword!');returnfalse;}if(cfmPwd==''){aler...