如何在浏览器窗口中显示此javascript代码段的结果？

Question

I'm fine with understanding what is happening in the console.log but I want to display the code in the browser window. I think I should use document.write but I am unsure about this.

var friends = {
bill: {
    firstName: "Bill",
    lastName: "Gates",
},
steve: {
    firstName: "Steve",
    lastName: "Gates",
}
};

var list = function(friends){
for (var key in friends){
    console.log(key);
}
};

var search = function(name){
for (var key in friends){
     if (friends[key].firstName === name){
    console.log(friends[key]);
    return friends[key];
    }   
}
};

Answer 1

You could use the alert function

alert("Hello World")

or you could use

document.write("Hello World")

which outputs the string "Hello World" to the position of the js snippet in the html. Alternatively, you could manipulate the DOM and set innerHTML on a div or span tag. If you add a tag with an id to your html like so,

<span id="foo"></span>

you can set the html contents with

document.getElementById("foo").innerHTML = "Hello World"

Of course, if your problem is to serialize the result of your function, use JSON.Stringify

alert(JSON.stringify({"hello": "world", 3: "bar"}));

Answer 2

In order to show your hash you can use document.write, but you need to "stringify" your data like that :

document.write(JSON.Stringify(friends));`

And if you would like something more beautiful :

document.write(JSON.stringify(friends, null, "<br/>"))

Documentation : https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify

Answer 3

Another possibility is to use jQuery's .html() to modify an existing HTML element on your page.

var showFriends=function(){
var x = JSON.stringify(friends,null,'</br>');
$('#myDiv').html('<p>'+x+'</p>');
};

jsfiddle: http://jsfiddle.net/wLZff/