// 种种原因 后台要写些前端的东西~ 记录一下
JS 判断表单项不能为空代码
<script type="text/javascript"> ???function check(form){ ???????var y=document.getElementById("form2"); ???????for(var i = 0;i < y.length-1;i++) ???????{ ???????????//当前表单所有input不能为空 ???????????if(y[i].value == null || y[i].value == "" || y[i].value == "undefined") ???????????{ ???????????????alert( y.length +"1"+ y[1].value + "2"+y[2].value + "所有栏目必须填写！请检查！"); ???????????????//一进入页面将光标定位到第一个input ???????????????y[i].focus(); ???????????????return false; ???????????} ???????} ???????return true; ????}</script>JS 笔记~
原文地址：https://www.cnblogs.com/gyrgyr/p/8391444.html