JavaScript validation picture type (extension) function sharing _javascript tips

The foreground call is as follows

Copy Code code as follows:

onclientclick= "Return Fuccheckjpgandgif" (Form1. File1.value); "--where File1 is the upload file control

Function code:

Copy Code code as follows:

function Fuccheckjpgandgif (strFileName) {
if (strFileName!= "") {
var strtype = strfilename.substring (strfilename.length-4, strfilename.length);
Strtype = Strtype.tolowercase ();
if ((strtype = = ". jpg") | | (Strtype = = ". gif") | | (strtype = = "jpeg") | | (Strtype = = ". bmp")) {
return true;
}
else {
Alert ("Please upload a jpg, GIF or BMP format picture, thank you!") ");
return false;
}
}
Alert ("Please upload a jpg, GIF or BMP format picture, thank you!") ");/* FROM http://yige.org/js/* *
return false;

}