如何在JavaScript中打印对象数组?

I have created an object array in JavaScript. How can I print the object array in the browser window, similar to print_r function in PHP?

我已经用JavaScript创建了一个对象数组。如何在浏览器窗口中打印对象数组，类似于PHP中的print_r函数?

var lineChartData = [{
            date: new Date(2009, 10, 2),
            value: 5
        }, {
            date: new Date(2009, 10, 25),
            value: 30
        }, {
            date: new Date(2009, 10, 26),
            value: 72,
            customBullet: "images/redstar.png"
        }];

10 个解决方案

#1

Simply use

简单地使用

yourContainer.innerHTML = JSON.stringify(lineChartData);

If you want something prettier, do

如果你想要更漂亮的，那就去做

yourContainer.innerHTML = JSON.stringify(lineChartData, null, 4);

Demonstration

示范

But if you just do this in order to debug, then you'd better use the console with console.log(lineChartData).

但是如果您只是为了调试而这样做，那么您最好使用控制台with console.log(lineChartData)。

#2

If you are using Chrome, you could also use

如果你用的是Chrome，你也可以用

console.log( yourArray );

#3

Did you check

你是否检查

console.table(yourArray);

More infos here: https://developer.mozilla.org/en-US/docs/Web/API/Console/table

更多信息:https://developer.mozilla.org/en-US/docs/Web/API/Console/table

#4

There is a wonderful print_r implementation for JavaScript in php.js library.

php中有一个很棒的JavaScript print_r实现。js库。

Note, you should also add echo support in the code.

注意，您还应该在代码中添加echo支持。

DEMO: http://jsbin.com/esexiw/1

演示:http://jsbin.com/esexiw/1

#5

Simple function to alert contents of an object or an array .
Call this function with an array or string or an object it alerts the contents.

一个简单的函数，用来提醒对象或数组的内容。用一个数组或字符串或一个对象来调用这个函数，它会通知内容。

Function

函数

function print_r(printthis, returnoutput) {
    var output = '';

    if($.isArray(printthis) || typeof(printthis) == 'object') {
        for(var i in printthis) {
            output += i + ' : ' + print_r(printthis[i], true) + '\n';
        }
    }else {
        output += printthis;
    }
    if(returnoutput && returnoutput == true) {
        return output;
    }else {
        alert(output);
    }
}

Usage

使用

var data = [1, 2, 3, 4];
print_r(data);

#6

document.getElementById('container').innerHTML = lineChartData[array_index]

#7

I use the below function to display a readout in firefox console log:

我使用下面的函数在firefox控制台日志中显示一个读数:

////        make printable string for console readout, recursively
var make_printable_object = function(ar_use)
{
////        internal arguments
var in_tab = arguments[1];
var st_return = arguments[2];
////        default vales when applicable
if (!in_tab) in_tab = 0;
if (!st_return) st_return = "";
////        add depth
var st_tab = "";
for (var i=0; i < in_tab; i++) st_tab = st_tab+"-~-~-";

////        traverse given depth and build string
for (var key in ar_use)
{
    ////        gather return type
    var st_returnType = typeof ar_use[key];
    ////        get current depth display
    var st_returnPrime = st_tab+ "["+key+"] ->"+ar_use[key]+"< is {"+st_returnType+"}";
    ////        remove linefeeds to avoid printout confusion
    st_returnPrime = st_returnPrime.replace(/(\r\n|\n|\r)/gm,"");
    ////        add line feed
    st_return = st_return+st_returnPrime+"\n";
    ////         stop at a depth of 15
    if (in_tab>15) return st_return;
    ////        if current value is an object call this function
    if ( (typeof ar_use[key] == "object") & (ar_use[key] != "null") & (ar_use[key] != null) ) st_return = make_printable_object(ar_use[key], in_tab+1, st_return);


}

////        return complete output
return st_return;

};

Example:

例子:

console.log( make_printable_object( some_object ) );

Alternatively, you can just replace:

或者，你可以替换:

st_return = st_return+st_returnPrime+"\n";

with

与

st_return = st_return+st_returnPrime+"<br/>";

to print out in a html page.

在html页面中打印。

#8

You can just use the following syntax and the object will be fully shown in the console:

您可以仅使用以下语法，并且该对象将在控制台中充分显示:

console.log('object evt: %O', object);

I use Chrome browser don't know if this is adaptable for other browsers.

我使用Chrome浏览器不知道这是否适用于其他浏览器。

#9

Emm... Why not to use something like this?

嗯…为什么不用这样的东西呢?

function displayArrayObjects(arrayObjects) {
        var len = arrayObjects.length, text = "";

        for (var i = 0; i < len; i++) {
            var myObject = arrayObjects[i];
            
            for (var x in myObject) {
                text += ( x + ": " + myObject[x] + " ");
            }
            text += "<br/>";
        }

        document.getElementById("message").innerHTML = text;
    }
            
            
            var lineChartData = [{
                date: new Date(2009, 10, 2),
                value: 5
            }, {
                date: new Date(2009, 10, 25),
                value: 30
            }, {
                date: new Date(2009, 10, 26),
                value: 72,
                customBullet: "images/redstar.png"
            }];

            displayArrayObjects(lineChartData);

<h4 id="message"></h4>

result:

结果:

date: Mon Nov 02 2009 00:00:00 GMT+0200 (FLE Standard Time) value: 5 
date: Wed Nov 25 2009 00:00:00 GMT+0200 (FLE Standard Time) value: 30 
date: Thu Nov 26 2009 00:00:00 GMT+0200 (FLE Standard Time) value: 72 customBullet: images/redstar.png

jsfiddle

#10

i use my custom function to print array in console

我使用我的自定义函数在控制台打印数组

this.print = function (data,bpoint=0) {
    var c = 0;
    for(var k=0; k<data.length; k++){
        c++;
        console.log(c+'  '+data[k]);
        if(k!=0 && bpoint === k)break;  
    }
}

usage : print(array);
or print(array,50); // 50 value to print only

用法:打印(数组);或打印(数组、50);// 50值仅供打印

#1