Array.prototype.removeBeginWithVal（删除数组内以某值开头的字符串对象）

Array扩展方法：

 //author: Kenmu
 //created time: 2015-03-16
 //function: 删除数组内以某值开头的字符串对象
 Array.prototype.removeBeginWithVal = function (val) {
     for(var i=0, len = this.length; i < len; i++) {
         if(this[i].indexOf(val) != -1) {
             this.splice(i, 1);
             break;
         }
     }
 }; 

调用方式：

 var arr =["Kenmu", "DemandTypeStringCode"];
 arr.removeBeginWithVal("DemandTypeStringCode"); //arr.length=1 after the operation of removeBeginWithVal