//将字符串转换为数组
function stringToArray(str){
	var str_arr = new Array();
	
	len = str.length;
	for (i=0;i<len;i++)
	{
	        str_arr[i] = str.substring(i, i+1);
	}
	
	return str_arr;
}
//去掉左边所有空格
String.prototype.lTrim = function(){
	var IntStrLength
	IntStrLength=this.length-1
	var j=0
	for (var i=0;i<=IntStrLength;i++)
		if (this.charAt(i)==" "){
			j=j+1
		}else{
		  break;
		}
	return this.substr(j);
}
//去掉右边所有空格
String.prototype.rTrim = function(){
	var IntStrLength
	IntStrLength=this.length-1
	var j=0
	for (var i=IntStrLength;i>=0;i--)
		if (this.charAt(i)==" "){
			j=j+1
		}else{
		break;
		}		
	IntStrLength=IntStrLength-j+1
	return this.substr(0,IntStrLength);
}
//去掉左右所有空格
String.prototype.trim = function(){
	return this.lTrim().rTrim();
}
//判断是否为空字符串
String.prototype.isBlank = function() {
	if(this.trim() == "") return true;
	return false;
}