What are the traversal methods of es6 map objects?

The map traversal methods are: 1. Use the forEach() function, the syntax "map.forEach(function(value,key){...}"; 2. Use the "for..of" loop statement, Syntax "for([key, value] of map object){...}".

The operating environment of this tutorial: windows7 system, ECMAScript version 6, Dell G3 computer.

Map is a structure of key-value pairs, with extremely fast search speed. It is created by passing in an array of arrays.

##Map object The traversal method

##forEach()

• ##for..of traverses keys, values, entries

• iterator.next() traverses keys, values, entries

• ##1. forEach() function

var map = [{ key : "百度", value : "李彦宏" }, { key : "阿里巴巴", value : "马云" }, ]; map.forEach(function(value, key) { console.log(key, value); })

2. for..of loop

keys = map.keys(); for (key of keys) { console.log(key); // map.get(key)可得value值。 } values = map.values(); for (value of values) { console.log(value); } entries = map.entries(); for ([key, value] of entries) { console.log(key, value); }

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