我有一个折线图，每次页面刷新时它都会更改数据，这很好，但我需要通过用户单击来刷新。这是因为页面上最终会有其他输入字段，刷新页面会破坏它们的当前会话。

jsfiddle - http://jsfiddle.net/darcyvoutt/dXtv2/

这是创建该行的代码设置：

function economyData() {  

    // Rounds
    var numRounds = 10;

    // Stability of economy
    var stable = 0.2;
    var unstable = 0.6;
    var stability = unstable;

    // Type of economy
    var boom = 0.02;
    var flat = 0;
    var poor = -0.02;
    var economyTrend = boom;

    // Range    
    var start = 1;
    var max = start + stability;
    var min = start - stability;

    // Arrays
    var baseLine = [];
    var economy = [];

    // Loop
    for (var i = 0; i < numRounds + 1; i++) {    

      baseLine.push({x: i, y: 1});

      if (i == 0) {

        economyValue = 1;

      } else {

        var curve = Math.min(Math.max( start + ((Math.random() - 0.5) * stability), min), max);        

        economyValue = Math.round( ((1 + (economyTrend * i)) * curve) * 100) / 100;

      }

      economy.push({x: i, y: economyValue});

    }

    return [
      {
        key: 'Base Line',
        values: baseLine   
      },
      {
        key: 'Economy',
        values: economy  
      }
    ];
  }

这是我尝试编写但更新失败的内容：

function update() {
      sel = svg.selectAll(".nv-line")
      .datum(data);

      sel
        .exit()
        .remove();

      sel
        .enter()
        .append('path')
          .attr('class','.nv-line');

      sel
        .transition().duration(1000);

  };

  d3.select("#update").on("click", data);