js判断文本是否溢出容器

onShowNameTipsMouseenter: function(e) {
        var target = e.target;
        var containerLength = $(target).width();
        var textLength = target.scrollWidth;
        var text = $(target).html();
        //console.log("contentLength:" + containerLength);
        //console.log("textLength", textLength);
        if (textLength > containerLength) {
            $(target).attr( "title", text);
        } else {
            $(target).removeAttr( "title");
        }
    }