js判断字符长度

//中文占用两个字符，英文占用一个字符
String.prototype.gblen = function() {  
	var len = 0;  
	for (var i=0; i
 
  127 || this.charCodeAt(i)==94) {  
				len += 2;  
			} else {  
				len ++;  
			}  
		}  
	return len;  
};
var str = "我的ad_ds.,/o他";
var str_1 = "das=+..,";
console.log(str.gblen());  //打印结果为15,
console.log(str_1.gblen());  //打印结果为8