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1 Problem description
In a dialog box, the user enters a set of strings that need to satisfy a length of 1 to 6 and need to be made up of 0-9,a-z, or A-Z, and other use cases are illegal.
2 Equivalence class Partitioning
| Valid equivalence classes | Number | Invalid equivalence class | Number | |
| Number of characters | 1-6 | 1 | 0 | 4 |
| 2 | 7 | 5 | ||
| Character type | A-z,a-z,0-9 | 3 | Other characters | 6 |
| Punctuation | 7 | |||
| Control characters | 8 |
3 Code and dialog box design
Use regular expressions to determine.
Code:
<HTML><Head><Scripttype= "Text/javascript">functionfoo () {varStr=document.getElementById (str'). Value; var st=/^[a-za-z0-9_]+$/; if (!st.test (str) | | str.length<1| | str.length>6) {Window.alert ("error"); } else{Window.alert ("succeed"); }}}</script>
4 test Cases and results:
| Case | overriding equivalence classes | Results |
| 04t6 | 1,3 | Success |
| 04,5 | 1,3,7 | Failed |
| Derterr | 5 | Failed |
| sdrt5& | 1,3,8 | Failed |
| Ha ha | 1,6 | Failed |
| Erz\ | 1,3,6 | Failed |
| Null value | 4 | Failed |
Results
Validation of test cases with JavaScript
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