text: myChart.showLoading();
  
  $.get('assets/chartdata/map/USA.json', function (usaJson) {
      myChart.hideLoading();
  
      echarts.registerMap('USA', usaJson, {
          Alaska: {              // 把阿拉斯加移到美国主大陆左下方
              left: -131,
              top: 25,
              width: 15
          },
          Hawaii: {
              left: -110,        // 夏威夷
              top: 28,
              width: 5
          },
          'Puerto Rico': {       // 波多黎各
              left: -76,
              top: 26,
              width: 2
          }
      });
      option = {
          title: {
              text: 'USA Population Estimates (2012)',
              subtext: 'Data from www.census.gov',
              sublink: 'http://www.census.gov/popest/data/datasets.html',
              left: 'right'
          },
          tooltip: {
              trigger: 'item',
              showDelay: 0,
              transitionDuration: 0.2,
              formatter: function (params) {
                  var value = (params.value + '').split('.');
                  value = value[0].replace(/(\d{1,3})(?=(?:\d{3})+(?!\d))/g, '$1,');
                  return params.seriesName + '<br/>' + params.name + ': ' + value;
              }
          },
          visualMap: {
              left: 'right',
              min: 500000,
              max: 38000000,
              inRange: {
                  color: ['#313695', '#4575b4', '#74add1', '#abd9e9', '#e0f3f8', '#ffffbf', '#fee090', '#fdae61', '#f46d43', '#d73027', '#a50026']
              },
              text:['High','Low'],           // 文本，默认为数值文本
              calculable: true
          },
          toolbox: {
              show: true,
              //orient: 'vertical',
              left: 'left',
              top: 'top',
              feature: {
                  dataView: {readOnly: false},
                  restore: {},
                  saveAsImage: {}
              }
          },
          series: [
              {
                  name: 'USA PopEstimates',
                  type: 'map',
                  roam: true,
                  map: 'USA',
                  itemStyle:{
                      emphasis:{label:{show:true}}
                  },
                  // 文本位置修正
                  textFixed: {
                      Alaska: [20, -20]
                  },
                  data:[
                      {name: 'Alabama', value: 4822023},
                      {name: 'Alaska', value: 731449},
                      {name: 'Arizona', value: 6553255},
                      {name: 'Arkansas', value: 2949131},
                      {name: 'California', value: 38041430},
                      {name: 'Colorado', value: 5187582},
                      {name: 'Connecticut', value: 3590347},
                      {name: 'Delaware', value: 917092},
                      {name: 'District of Columbia', value: 632323},
                      {name: 'Florida', value: 19317568},
                      {name: 'Georgia', value: 9919945},
                      {name: 'Hawaii', value: 1392313},
                      {name: 'Idaho', value: 1595728},
                      {name: 'Illinois', value: 12875255},
                      {name: 'Indiana', value: 6537334},
                      {name: 'Iowa', value: 3074186},
                      {name: 'Kansas', value: 2885905},
                      {name: 'Kentucky', value: 4380415},
                      {name: 'Louisiana', value: 4601893},
                      {name: 'Maine', value: 1329192},
                      {name: 'Maryland', value: 5884563},
                      {name: 'Massachusetts', value: 6646144},
                      {name: 'Michigan', value: 9883360},
                      {name: 'Minnesota', value: 5379139},
                      {name: 'Mississippi', value: 2984926},
                      {name: 'Missouri', value: 6021988},
                      {name: 'Montana', value: 1005141},
                      {name: 'Nebraska', value: 1855525},
                      {name: 'Nevada', value: 2758931},
                      {name: 'New Hampshire', value: 1320718},
                      {name: 'New Jersey', value: 8864590},
                      {name: 'New Mexico', value: 2085538},
                      {name: 'New York', value: 19570261},
                      {name: 'North Carolina', value: 9752073},
                      {name: 'North Dakota', value: 699628},
                      {name: 'Ohio', value: 11544225},
                      {name: 'Oklahoma', value: 3814820},
                      {name: 'Oregon', value: 3899353},
                      {name: 'Pennsylvania', value: 12763536},
                      {name: 'Rhode Island', value: 1050292},
                      {name: 'South Carolina', value: 4723723},
                      {name: 'South Dakota', value: 833354},
                      {name: 'Tennessee', value: 6456243},
                      {name: 'Texas', value: 26059203},
                      {name: 'Utah', value: 2855287},
                      {name: 'Vermont', value: 626011},
                      {name: 'Virginia', value: 8185867},
                      {name: 'Washington', value: 6897012},
                      {name: 'West Virginia', value: 1855413},
                      {name: 'Wisconsin', value: 5726398},
                      {name: 'Wyoming', value: 576412},
                      {name: 'Puerto Rico', value: 3667084}
                  ]
              }
          ]
      };
  
      myChart.setOption(option);
  });