1, forEach iterate:
map.forEach (function (value, Key) {
the console.log (value, Key);
});
function first parameter is the attribute value, the second parameter is a property
2, for-of traverse:
①for (Item of the let Map) {
}
traversal result is an array
②for (map.values of the let Item ()) {
}
traversal attribute value
③for (map.keys of the let Item ()) {
}
traversal properties
3, entries traversal:
for (map.entries of the let Item ()) {
}
through the results with forEach