计算汉字长度

//计算汉字长度
function DataLength(fData) {
    var reg = /[u4e00-u9fa5]/g;
    return fData.match(reg).length;
}

用到地方标题样式

slideNav: [
    { "title": "电子名片","type":"4","icon":"../../images/3.png"},
    {"title": "维修技师","type":"5","icon":"../../images/1.png"},
    {"title":"服务顾问","type":"2","icon":"../../images/3.png"},
    {"title":"销售顾问","type":"3","icon":"../../images/1.png"},
    {"title":"车险顾问","type":"1","icon":"../../images/3.png"},
    { "title": "报价单","type":"2","icon":"../../images/1.png"},
    { "title": "二手车评估师","type":"3","icon":"../../images/1.png"},
    { "title": "车险顾问","type":"1","icon":"../../images/3.png"}
    ]

var s_nav = slideNav;
 for (let nav_index in s_nav) {
     var nav_length = ataLength(s_nav[nav_index]["title"]);
     var length_class = (nav_length == 2 || nav_length == 4) ? 'duble_row' : 'third_row';
     slideNav[nav_index]['length'] = length_class;
 }
 this.setData({
     "slideNav": this.data.slideNav
 });