Question

如何从＆＃39; self＆＃39;中获取保存的值？语法，使用变量作为＆＃39;键＆＃39;？

部分代码：

<body>
    <div id="container" style="width: 75%;">
        <canvas id="canvas"></canvas>
    </div>
    <script>
    weekdays=["Monday", "Tuesday", "Wednesday", "Thurday", "Friday", "Saturday", "Sunday", "Monday"]
    var d=new Date()
        var MONTHS = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"];

        var randomScalingFactor = function() {
            return (Math.random() > 0.5 ? 1.0 : 0) * Math.round(Math.random() * 100);
        };

        var barChartData = {
           labels: [weekdays[d.getDay()], weekdays[d.getDay()-6], weekdays[d.getDay()-5], weekdays[d.getDay()-4], weekdays[d.getDay()-3], weekdays[d.getDay()-2],weekdays[d.getDay()-1]    ],
            datasets: [{
                label: 'Logged Time',
                backgroundColor: "rgba(220,220,220,0.5)",
                data: sessions
            }
            ]

        };

        window.onload = function() {
            var ctx = document.getElementById("canvas").getContext("2d");
            window.myBar = new Chart(ctx, {
                type: 'bar',
                data: barChartData,
                options: {
                    // Elements options apply to all of the options unless overridden in a dataset
                    // In this case, we are setting the border of each bar to be 2px wide and green
                    elements: {
                        rectangle: {
                            borderWidth: 2,
                            borderColor: 'rgb(0, 255, 0)',
                            borderSkipped: 'bottom'
                        }
                    },
                    responsive: true,
                    title: {
                        display: true,
                        text: 'Vision Logged Hours'
                    }
                }
            });

        };




    </script>

我无法执行切换声明，因为我有21个值......
为了使其更清晰，如果class Foo: def __init__(self, n1, n2, n3, ...): self.node_1 = n1 self.node_2 = n2 self.node_3 = n3 ... def get_node(n): return self."node_"+n # This is wrong. What should I use?，我想要值n = 2。因此self.node_2为n = 3等，

Answer 1

您可以使用getattr(class_obj, 'property')。在传递类的对象和属性以作为function ClickSkin(id) { // Get the div and set the div orange var selected_div = document.getElementById("pic"+id); selected_div.style.backgroundColor = 'orange'; for(var i = 0; i < 310; i++) { if(document.getElementById("pic"+i)) { if(i != id) { document.getElementById("pic"+i).style.backgroundColor='white'; } } } }访问时，您将获得相应属性的值。以下是示例代码：

string

但是，您还应该将class MyClass: def __init__(self, n1, n2): self.node_1 = n1 self.node_2 = n2 def get_node(self, n): return getattr(self, n) x = MyClass('value_1', 'value_2') print x.get_node('node_1') # Output: 'value_1'方法更新为使用__init__()，因为您提到了大量的属性。使用setattr(class_obj, 'property', value)和enumerate()动态设置属性。下面是一个例子：

**args

按名称获取变量

1 个答案: