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JavaScript Basics, Login verification

Source: Internet
Author: User
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1, <script></script> three ways to use:

A put in <body>



<body>
<p id= "Meto" > Standard Beijing time </p>
<script >
document.getElementById (' Meto '). InnerHTML = Date ()
</script>
<script type= "Text/javascript" >alert ("Guangzhou Business School")  </script>

</body>












b put in 


C placed in JS file
Three ways to output data:

 
  
    
  
   
       
    
    1. Use the document.write () method to write content to an HTML document.
      <body><script>document.write (Date ()) </script></body>
      2.  
    
    2. Use the Window.alert () pop-up warning box.
      <body><button type= "button" Onclick=window.alert ("Please wait ...") > Login </button></body>
      3.  
    
    3. Writes to an HTML element using InnerHTML.
      4.  
   
    
 
  
<body><p id= "Meto" > China Standard Time </p><script>document.getelementbyid ("Meto"). Innerhtml=date () </script></body>
3, 4, 5 questions
<! DOCTYPE html>
function Fnlogin () {    var ouname = document.getElementById ("uname")    var oupass = document.getElementById ("UPass ")    var oerror = document.getElementById (" Error_box ")    if (OUname.value.length > 20 | | OUname.value.length < 6) {        oerror.innerhtml = "Please enter user name 6-20-bit character"    }    if (OUpass.value.length > | | oupass . value.length < 6) {        oerror.innerhtml = "Please enter password 6-20-bit character"    }}
JavaScript Basics, Login verification

                

                    
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