"xAxis":[{"data":["2015-5-13","2015-5-14","2015-5-15","2015-5-16","2015-5-17","2015-5-18","2015-5-19","2015-5-20","2015-5-21","2015-5-22","2015-5-23","2015-5-24","2015-5-25"],
 "type":"category",
 "axisLabel":{
 interval: 0
 }
}],

function extensionOne(myChart) {
 var id = document.getElementById("extensionOne");
 //判断是否创建过div框,如果没有创建过，则创建。（创建时，默认隐藏）
 if (!id) {
  var div = "<div id = 'extensionOne' sytle=\"display:none\"></div>";
  $('html').append(div);
 }

 var arrow_left = '20px';
 //鼠标悬浮事件
 myChart.on('mouseover', function (params) {
  if (params.componentType != "xAxis") {
   return;
  }

  //设置div框样式，并为其填充值。
  $('#extensionOne').css({
   "position": "absolute",
   "color": "#90979c",
   // "border": "solid 0px white",
   "font-family": "Arial",
   "font-size": "14px",
   "padding": "5px",
   "display": "inline"
  }).text(params.value);
  var xx_text = params.event.offsetX - 35;
  arrow_left = xx_text;

  $("#talentDemandDistribution").mousemove(function (event) {
   // console.log("X轴坐标：" + event.pageX + " Y轴坐标：" + event.pageY);
   var xx = event.pageX - 30;
   var yy = event.pageY + 10;
   $('#extensionOne').css('top', yy).css('left', xx);
  });
 });

 myChart.on('mouseout', function (params) {
  $('#extensionOne').css('display', 'none');
 });
}
{
 ...
 ...
 var chart = echarts.init(document.getElementById('talentDemandDistribution'));
 chart.setOption(option);

 //在echarts 初始化完成后，调用自定义的鼠标悬浮事件方法
 extensionOne(chart);
}