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JavaScript Basics, Login front-end verification

Source: Internet
Author: User
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<!DOCTYPE HTML><HTMLLang= "en"><Head>    <MetaCharSet= "UTF-8">    <title>Landing</title>   <Linkhref=".. /static/zz.css "rel= "stylesheet"type= "Text/css">    <Script>        functionMyLogin () {varUName=document.getElementById ("name"); varUPass=document.getElementById ("UPass"); varUerror=document.getElementById ("Error_box"); if(UName.value.length<6) {uerror.innerhtml= "User name is at least 6 digits! "            }            if(UName.value.length> -) {uerror.innerhtml= "The user name can not be greater than digits! "            }            if(UName.value.length>=6&&UName.value.length<= -){                if(UPass.value.length<6) {uerror.innerhtml= "Password is at least 6 digits! "                }                if(UPass.value.length> -) {uerror.innerhtml= "The password can not be greater than digits! "                }            }        }    </Script></Head><Bodybgcolor= "#696969">    <Divclass= "box">        <H2>Login</H2>        <Divclass= "Input-box" >            <P>Please enter the user name</P>                <inputID= "Name"type= "text"placeholder= "Name">        </Div>        <Divclass= "Input_box">            <P>Please enter your password</P>                <inputID= "UPass"type= "Password"placeholder= "Password"><BR>            <ahref= "a">Forget password</a>        </Div>        <DivID= "Error_box"><BR></Div>         <Divclass= "Input_box">            <Buttononclick= "MyLogin ()">Login</Button>        </Div>    </Div></Body></HTML>
    . Box{        margin:0 auto;         Text-align:Center;         width:500px; height:300px;         Border:2px solid #D87093;         background:#FFC0CB;    }

Three ways to use <script></script>:

      1. Put in the <body>
      2. Put in the
      3. Placed in an external JS file

Three ways to output data:

      1. Use the document.write () method to write content to an HTML document.
      2. Use the Window.alert () pop-up warning box.
      3. Writes to an HTML element using InnerHTML.
        1. Use the ID property to identify the HTML element.
        2. Use the document.getElementById (ID) method to access HTML elements.
        3. Use innerHTML to get or insert element content.

<!DOCTYPE HTML><HTMLLang= "en"><Head>    <MetaCharSet= "UTF-8">    <title>Time</title></Head><Bodystyle= "Text-align:center;bgcolor:pink">    <Divstyle= "border:1px dashed #696969; width:600px;margin:0 Auto">        <h4>Current time</h4>        <PID= "Demo"></P>    </Div>    <P></P>    <Script>document.write ("hello!") document.getElementById ("Demo"). InnerHTML=Date (); </Script>    <P></P>    <Buttontype= "button"onclick=window.alert ("The user does not exist! ")>Login</Button></Body></HTML>

JavaScript Basics, Login front-end verification

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