Js Form Verification Code memo

1: js string length limit, judgment character length, js restriction input, restriction not input, textarea length limit 2.: js determines Chinese characters, determines whether Chinese characters are entered, only Chinese characters can be entered 3: js determines whether to enter English letters, only English letters 4: js can only enter numbers, determine numbers, verify numbers ,... syntaxHighlighter. all ();

 

1: js string length limit, determination character length, js restriction input, restriction not input, textarea length limit

2.: js judges Chinese characters, determines whether Chinese characters are needed, and can only input Chinese Characters

3: js determines whether the input is in English. Only English can be entered.

4: javascript can only enter numbers, determine numbers, verify numbers, detect numbers, determine whether they are numbers, and only enter numbers

5: Only English characters and numbers can be entered

6: js email verification, js judgment email, mailbox/mailbox format Verification

7: js character filtering, blocking keywords

8: js password verification and password Determination

2.1: js is not empty, empty, or not an object. The judgment is empty. The judgment is not empty.

2.2: compare whether the values of two form items are the same

2.3: The form can only contain numbers and "_",

2.4: Number/length limit entered for Form Items

2.5: Chinese/English/number/email address legality judgment

2.6: Restrict characters that cannot be entered for Form Items

2.7 form User Control

2.8: Common verification functions for form text fields

 

1. length limit

Script

Function test ()

{

If (document. a. B. value. length> 50)

{

Alert ("cannot exceed 50 characters! ");

Document. a. B. focus ();

Return false;

}

}

Script

 

2. Only Chinese characters are allowed

 

3. "English only