1 //定义一个源数组 2 var datalist = ["tiger", "dragon", "snake", "horse", "sheep"]; 3 //构建一个集合,将其保存在变量set中 4 var set = d3.set(datalist); 5 6 7 console.log(set.has("tiger")) //返回值true 8 console.log(set.add("monkey")) //返回值monkey 9 10 console.log(set.values()) //返回值["tiger", "dragon", "snake", "horse", "sheep", "monkey"] 11 12 //集合中的每一个元素都将调用function函数 13 set.foreach(function(value){ 14 console.log(value) //返回值分别打印出tiger、dragon、snake、horse、sheep、monkey 15 }) 16 17 console.log(set.empty()) //返回值false 18 console.log(set.size()) //返回值6
1 var datalist = ["tiger","tiger", "dragon", "snake", "horse", "sheep"]; 2 var set = d3.set(datalist); 3 set.add("dragon"); 4 5 console.log(set.values()) //返回值 ["tiger", "dragon", "snake", "horse", "sheep"]
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