Echarts 报错：Uncaught Error: [MODULE_MISS]"echarts/config" is not exists!

require(  
    [  
        ‘echarts‘,  
        ‘echarts/chart/scatter‘  
    ],  
    function (ec) {  
        // 基于准备好的dom，初始化echarts图表  
        myScatter = ec.init(document.getElementById(‘mainScatter‘));   
  
       。。。  
          
    }  
);  

// 气泡click事件  
var ecConfig = require(‘echarts/config‘);  
   myScatter.on(ecConfig.EVENT.CLICK, function(param){  
   var mes = ‘【‘ + param.type + ‘】‘;  
   alert(mes);  
});