Js operation input box prompts and responds to mouse events _ javascript skills

The default prompt value is displayed in the registration website input box. When the mouse focus is obtained, the default value is deleted. When the user does not enter the focus, and restore the default prompt value. We often encounter some input boxes. For example, the default prompt value is displayed in the registration website input box. When obtaining the mouse focus, the default value is deleted, when the user does not enter the focus to exit, the default prompt value is restored. This method is implemented using js Code as follows:

Html code:

The Code is as follows:

Js Code:

The Code is as follows:

Function fn_focus (ele ){
If (ele. value = ele. defaultValue ){
Ele. value = '';
}
}
Function fn_blur (ele ){
Var reg =/^ [\ s] * $ /;
If (reg. test (ele. value) | ele. value = ele. defaultValue ){
Ele. value = ele. defaultValue;
}
}