[英]How to remove the use of ES6 arrow function in this code
我对ES6箭头功能不熟悉,我从供应商处收到以下代码:
Highcharts.seriesType('linearregression', 'pareto', {
name: 'Linear Regression'
}, {
setDerivedData: function() {
if (this.baseSeries.yData.length > 1) {
var xValues = this.baseSeries.xData,
yData = this.baseSeries.yData,
mainData = this.baseSeries.data;
var sum = [0, 0, 0, 0, 0],
len = xValues.length,
data, rise, gradient, intercept;
Highcharts.each(xValues, function(x, i) {
sum[0] += x;
sum[1] += yData[i];
sum[2] += x * x;
sum[3] += x * yData[i];
sum[4] += yData[i] * yData[i];
});
run = ((len * sum[2]) - (sum[0] * sum[0]));
rise = ((len * sum[3]) - (sum[0] * sum[1]));
gradient = run === 0 ? 0 : (rise / run);
intercept = (sum[1] / len) - ((gradient * sum[0]) / len);
function round(value, decimals) {
return Number(Math.round(value + 'e' + decimals) + 'e-' + decimals);
};
function predict(x) {
return [mainData[x].name, round((gradient * x) + intercept, 5)];
};
points = xValues.map(p => predict(p));
this.setData(points, false);
}
}
});
我今天想将其投入生产,但是发现IE不支持ES6。 如何重写它以删除箭头功能(下一行)?
points = xValues.map(p => predict(p));
怎么样
points = xValues.map(function(p) { return predict(p); });
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