/** js截取字符串,中英文都能用 * param str:需要截取的字符串 * param len: 需要截取的长度*/function Substr (str, len) { var str_length = 0; var str_len = 0; str_cut = new String(); str_len = str.length; for (var i = 0; i < str_len; i++) { a = str.charAt(i); str_length++; if (escape(a).length > 4) { //中文字符的长度经编码之后大于4 str_length++; } str_cut = str_cut.concat(a); if (str_length >= len) { str_cut = str_cut.concat("..."); return str_cut; } } //如果给定字符串小于指定长度,则返回源字符串; if (str_length < len) { return str; }}