javascript - 如果语句检查，不管字母大小写

我想使我的if语句灵活。如果我在输入框中输入了确切的信息，则会触发我的语句，但是如果用户将其以小写或大写形式输入，则无法检测到。这是代码。

var find = _.findWhere($scope.allCast, {name: castName});
            if(!find){
                var cast = {
                    cpPortfolioItemId: id,
                    name: castName,
                    job: 'cast',
                    role: castRole
                };
                ContentAssessmentFactory.addCastDetail(cast);
            }else{
                $window.alert('Cast name is already exist.');
            }

任何帮助将不胜感激。

最佳答案

您可以使用_.filter()转换小写或大写形式的cast.name和castName。

//Return you an array of matched elements
var find = _.filter($scope.allCast, function(cast){
    //Convert both text in lower case and compare
    //If required you can use .trim() like castName.trim().toLowerCase() to strip whitespace
    return cast.name.toLowerCase() == castName.toLowerCase();
});

if(find.length == 0){
    var cast = {
        cpPortfolioItemId: id,
        name: castName,
        job: 'cast',
        role: castRole
    };
    ContentAssessmentFactory.addCastDetail(cast);
}else{
    $window.alert('Cast name is already exist.');
}