返回未定义的特殊Javascript库
正如在标题中所说,我正在尝试从头创建一个Javascript库,它必须调整使用GoogleChart创建的图表的输出 为了更好地解释,不要这样做:返回未定义的特殊Javascript库,javascript,data-structures,google-visualization,Javascript,Data Structures,Google Visualization,正如在标题中所说,我正在尝试从头创建一个Javascript库,它必须调整使用GoogleChart创建的图表的输出 为了更好地解释,不要这样做: var options = { title: 'Top Consuming Nations - Thousand barrels daily', hAxis: {title: 'Year'}, width: 1050, height : 400, vAxes: [ {title: 'T
var options = {
title: 'Top Consuming Nations - Thousand barrels daily',
hAxis: {title: 'Year'},
width: 1050, height : 400,
vAxes: [
{title: 'Top Countries', titleTextStyle: {color: '#FF0000'}, maxValue: max}, // Left axis maxValue: 60000
{title: 'Total World', titleTextStyle: {color: '#FF0000'}, maxValue: tot} // Right
],
series:{
6: {targetAxisIndex: 1}
},
legend: { position: 'top', alignment: 'start' },
};
var chart = new google.visualization.LineChart(document.getElementById(chartDiv));
chart.draw(data, options);
我想使用我创建的库(skewedChart)执行类似操作:
这是我的库的代码,包含在skewedChart.js文件中:
var skewedChart = {};
skewedChart.visualization = {};
skewedChart.visualization.LineChart = function(location) {
this.chart = new google.visualization.LineChart(location) ;
this.draw = function(data,option) {
option.height = this.skewHeight(option.width, option.skew) ;
option.vAxes[0].maxValue = this.skewMax(option.vAxes[0],option.skew) ;
this.chart.draw(data,option);
}
this.skewHeight= function(width,skewFactor) {
}
this.skewMax= function(series, skewFactor) {
}
};
问题是图表返回“未定义”,为什么?如何才能做得更好?如果函数调用中没有返回任何内容,它将返回未定义的内容,这就是您看到的内容。您需要添加
并返回此信息代码>在函数的末尾。你没有返回任何东西…@epascarello甚至我也注意到了同样的情况
var skewedChart = {};
skewedChart.visualization = {};
skewedChart.visualization.LineChart = function(location) {
this.chart = new google.visualization.LineChart(location) ;
this.draw = function(data,option) {
option.height = this.skewHeight(option.width, option.skew) ;
option.vAxes[0].maxValue = this.skewMax(option.vAxes[0],option.skew) ;
this.chart.draw(data,option);
}
this.skewHeight= function(width,skewFactor) {
}
this.skewMax= function(series, skewFactor) {
}
};