js截取所需字符串长度

//title :字符串  ；interceptLength：所需的长度

function TitleThumbnail(title, interceptLength, thumbnailCharacter) {

    if (!interceptLength) {

        interceptLength = 16;

    }

    if (!thumbnailCharacter) {

        thumbnailCharacter = "..";

    }

   return CharacterThumbnail(title, interceptLength, thumbnailCharacter);

}

 

 

function CharacterThumbnail(originString, interceptLength, thumbnailCharacter) {

    if (originString == null || originString=="") {

        return "";

    }

 

    if (interceptLength <= 0) {

        return originString;

    }

 

    else if (originString.length <= interceptLength) {

        return originString;

    }

    else {

        return originString.substring(0, interceptLength) + thumbnailCharacter;

    }

}