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@@ -14,7 +14,10 @@
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* set() 往集合中添加键值对
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* get() 获取集合中的键值
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* has() 查找Map集合中是否包含所要查找的属性 返回值为布尔值
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- * clear() 清空集合中的所有值 返回undefined
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+ * clear() 清空集合中的所有值
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+ * entries() 键值对
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+ * keys() 键值对中的下标
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+ * values() 键值对中的值
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*
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*/
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let s1 = new Map();
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@@ -45,10 +48,19 @@
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arr2.set("school","US");
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console.log(arr2);
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- for(a of arr2.entries()) {
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- console.log(a,'1');
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+ for(let a of arr2.entries()) {
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+ console.log(a,'entries');
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}
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- // console.log(arr2.entries());
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+ for(let a of arr2.keys()) {
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+ console.log(a,'keys');
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+ }
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+ for(let a of arr2.values()) {
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+ console.log(a,'values');
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+ }
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+
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+ console.log(arr2.keys().next().value)
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+ console.log(arr2.entries().next().value)
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+ console.log(arr2.values().next().value)
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</script>
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</body>
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e