js截取中英文字符串

原因：

常常在项目中遇到特殊的需求在固定width的容器中，要去显示固定长度的文字，但有些名称过长或是中英文，判断代码 （截取需要的长度，过长加省略号）function stringSp(str, len) {var newLength = 0;var newStr = "";var chineseRegex = /[^\x00-\xff]/g;var singleChar = "";var strLength = str.replace(chineseRegex, "**").length;for (var i = 0; i < strLength; i++) {singleChar = str.charAt(i).toString();if (singleChar.match(chineseRegex) != null) {newLength += 2;}else {newLength++;}if (newLength > len) {break;}newStr += singleChar;}if (strLength > len) {newStr += "...";}return newStr;}

var str = “abc张三”；

var str1 = stringSp(str,3) str1 =>”abc…”

var str2 = stringSp(str,5) str2 =>”abc张…”

var str3 = stringSp(str,7) str3 =>”abc张三”