Get all keys of a JavaScript object

2018-06-09 02:27:50

I was wondering if there was a quick way to extract keys of associative array into an array, or comma-separated list using JavaScript (jQuery is ok).

options = {key1: "value1", key2: "value2"};

Result should be the array:

["key1", "key2"]

or just a string:

"key1, key2"

You can easily get an array of them via a for loop, for example:

var keys = [];
for(var key in options) {
  if(options.hasOwnProperty(key)) { //to be safe
    keys.push(key);
  }
}

Then use keys how you want, for example:

var keyString = keys.join(", ");

You can test it out here. The .hasOwnProperty() check is to be safe, in case anyone messed with the object prototype and such.

options = {key1: "value1", key2: "value2"};
keys = Object.keys(options);

一个jQuery的方式：

var keys = [];
options = {key1: "value1", key2: "value2"};
$.each(options, function(key, value) { keys.push(key) })
console.log(keys)

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