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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