What are the methods to verify whether the javascript form is empty?

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form validation

拿到表单内容进行非空验证（单独函数封装，方便后面调用）

为空则向P里面加内容

要阻断表单提交，不然直接跳走了e.preventDefault()

提交时要判定是否为空

键值提交也要判定是否为空

Document div { width: 600px; height: 600px; margin: 50px auto; background-color: skyblue; padding: 20px;}div input { width: 520px; height: 50px; margin-top: 50px;}

var formEle = document.querySelector('form')var nameinput = document.querySelector('input[name="name"]')var passwordinput = document.querySelector('input[name="password"]')var pnameTip = document.querySelector('.nameTip')var ppasswordTip = document.querySelector('.passwordTip')//是否为空判定function checkUserNameNull(){ if(nameinput.value==''){ pnameTip[xss_clean]='输入名字' return false }else{ pnameTip[xss_clean]='' return true }}//失去焦点进行用户名是否为空验证 nameinput.οnblur=function (){ checkUserNameNull() }//是否为空判定function checkPasswordNull(){ if(passwordinput.value==''){ ppasswordTip[xss_clean]='输入名字' return false }else{ ppasswordTip[xss_clean]='' return true }}//失去焦点进行密码框是否为空验证 passwordinput.οnblur=function (){ checkPasswordNull() }//提交时验证formEle.onsubmit = function (e) { e.preventDefault() //阻止表单默认提交 var nameisok=checkUserNameNull() var passwordisok= checkPasswordNull()//都满足不为空提交 if(nameisok && passwordisok){ location.href = 'https://www.baidu.com/' }}//键值提交document.οnkeyup=function (e){ var keyCode=e.keyCode|| e.which if(keyCode==13&&e.shiftKey){ var nameisok=checkUserNameNull() var passwordisok= checkPasswordNull() if(nameisok && passwordisok){ location.href = 'https://www.baidu.com/' } }} 感谢各位的阅读!关于"javascript表单是否为空的验证方法有哪些"这篇文章就分享到这里了，希望以上内容可以对大家有一定的帮助，让大家可以学到更多知识，如果觉得文章不错，可以把它分享出去让更多的人看到吧!