验证扩展(jQuery)

.slice() 在值上,如下所示:

​$("form").submit(function(e) {
    $("#css-file, #css-url").each(function() {
        if(this.value.slice(-4) != ".css") {
            e.preventDefault();
            alert(this.value + " is not a .css file");
        }
    });
});​

You can give it a try here

/.css$/ .