这是本文档旧的修订版！

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4.7 饼图、柱图标签按长度折行

饼图标签

          formatter: function(param){
              return param.name +String.fromCharCode("10")
                    + param.value +String.fromCharCode("10")
                    + param.percent;
          },

柱图轴标签

          formatter:function(param){
              function fixedLengthFormatString(str,num){
                  if(str == null || str == undefined) return null;
                  if(!(/^[0-9]*[1-9][0-9]*$/.test(num))) return null;
                  var array = "";
                  var len = str.length;
                  for(var i=0;i<(len/num);i++){
                    if((i+1)*num > len){
                        array = array + str.substring(i*num,len) + String.fromCharCode("10");
                    }else{
                        array = array + str.substring(i*num,(i+1)*num);
                    }
                  }
                  return array;
              }
            return  fixedLengthFormatString(param, 5);//五个字符折行
          },