option = { title: { text: '消费者效用最大化', textStyle: { fontSize: 25, fontFamily: '微软雅黑' }, right: '50%' }, tooltip: { trigger: 'axis' }, legend: { data: ['U1', 'U2', 'U3','预算线I'], top: '50%', right: '10%', textStyle: { fontSize: 15 } }, toolbox: { feature: { saveAsImage: {} } }, grid: {}, xAxis: { type: 'value', name: '商品2', nameTextStyle: { fontSize: 15, }, axisTick: { show: false }, axisLabel: { show: false } }, yAxis: { type: 'value', name: '商品1', nameTextStyle: { fontSize: 15, }, axisTick: { show: false }, axisLabel: { show: false } }, series: [{ name: 'U1', type: 'line', coordinateSystem: 'cartesian2d', data: [ [0.2, 5], [0.3, 3.333333333], [0.4, 2.5], [0.5, 2], [0.6, 1.666666667], [0.7, 1.428571429], [0.8, 1.25], [0.9, 1.111111111], [1, 1], [1.1, 0.909090909], [1.2, 0.833333333], [1.3, 0.769230769], [1.4, 0.714285714], [1.5, 0.666666667], [1.6, 0.625], [1.7, 0.588235294], [1.8, 0.555555556], [1.9, 0.526315789], [2, 0.5], [2.1, 0.476190476], [2.2, 0.454545455], [2.3, 0.434782609], [2.4, 0.416666667], [2.5, 0.4], [2.6, 0.384615385], [2.7, 0.37037037], [2.8, 0.357142857], [2.9, 0.344827586], [3, 0.333333333], [3.1, 0.322580645], [3.2, 0.3125], [3.3, 0.303030303], [3.4, 0.294117647], [3.5, 0.285714286], [3.6, 0.277777778], [3.7, 0.27027027], [3.8, 0.263157895], [5,0.2] ] }, { name: 'U2', type: 'line', coordinateSystem: 'cartesian2d', data: [ [1.2, 6], [1.3, 4.333333333], [1.4, 3.5], [1.5, 3], [1.6, 2.666666667], [1.7, 2.428571429], [1.8, 2.25], [1.9, 2.111111111], [2, 2], [2.1, 1.909090909], [2.2, 1.833333333], [2.3, 1.769230769], [2.4, 1.714285714], [2.5, 1.666666667], [2.6, 1.625], [2.7, 1.588235294], [2.8, 1.555555556], [2.9, 1.526315789], [3, 1.5], [3.1, 1.476190476], [3.2, 1.454545455], [3.3, 1.434782609], [3.4, 1.416666667], [3.5, 1.4], [3.6, 1.384615385], [3.7, 1.37037037], [3.8, 1.357142857], [3.9, 1.344827586], [4, 1.333333333], [4.1, 1.322580645], [4.2, 1.3125], [4.3, 1.303030303], [4.4, 1.294117647], [4.5, 1.285714286], [4.6, 1.277777778], [4.7, 1.27027027], [4.8, 1.263157895], [6,1.2] ] }, { name: 'U3', type: 'line', coordinateSystem: 'cartesian2d', data: [ [2.2, 7], [2.3, 5.333333333], [2.4, 4.5], [2.5, 4], [2.6, 3.666666667], [2.7, 3.428571429], [2.8, 3.25], [2.9, 3.111111111], [3, 3], [3.1, 2.909090909], [3.2, 2.833333333], [3.3, 2.769230769], [3.4, 2.714285714], [3.5, 2.666666667], [3.6, 2.625], [3.7, 2.588235294], [3.8, 2.555555556], [3.9, 2.526315789], [4, 2.5], [4.1, 2.476190476], [4.2, 2.454545455], [4.3, 2.434782609], [4.4, 2.416666667], [4.5, 2.4], [4.6, 2.384615385], [4.7, 2.37037037], [4.8, 2.357142857], [4.9, 2.344827586], [5, 2.333333333], [5.1, 2.322580645], [5.2, 2.3125], [5.3, 2.303030303], [5.4, 2.294117647], [5.5, 2.285714286], [5.6, 2.277777778], [5.7, 2.27027027], [5.8, 2.263157895], [7,2.2] ] }, { name: '预算线I', type: 'line', coordinateSystem: 'cartesian2d', data: [ [0, 4], [0.2, 3.8], [0.4, 3.6], [0.6, 3.4], [0.8, 3.2], [1, 3], [1.2, 2.8], [1.4, 2.6], [1.6, 2.4], [1.8, 2.2], [2, 2], [2.2, 1.8], [2.4, 1.6], [2.6, 1.4], [2.8, 1.2], [3, 1], [3.2, 0.8], [3.4, 0.6], [3.6, 0.4], [3.8, 0.2], [4, 0] ] }] };