js 控制超出字数显示省略号

//多余显示省略号
function wordlimit(cname, wordlength) {
    var cname = document.getElementsByClassName(cname);
    for (var i = 0; i < cname.length; i++) {　　　　　　
        var nowLength = cname[i].innerHTML.length;
        if (nowLength > wordlength) {
            cname[i].innerHTML = cname[i].innerHTML.substr(0, wordlength) + '...';
        }　　　　　　
    }　
};

//调用，description为class名
wordlimit('description', 30)