截取文本内容 包括中英文 多余则显示省略号

function subStringTxt(str, len) {var strlen = 0;var newStr;var flag = 0;if (str == null) {return ""}for (var i = 0; i < str.length; i++) {if (str.charCodeAt(i) > 127) {//中文字符占两位strlen += 2;} else {strlen++;}if (strlen > len) {newStr = str.substring(0, i) + "...";flag = 1;break;}}return flag == 1 ? newStr : str}subStringTxt("fhdj发动风华绝代fdgf", 10)