[英]How do I fix this simple Javascript 'for loop'?
I have a number of Javascript objects. 我有许多Javascript对象。
I want a simple 'for loop' (in JS) that prints out the key:value pairs within each object. 我想要一个简单的“ for循环”(在JS中),在每个对象中打印出key:value对。
I've shown what I've done below (and here it is in a FIDDLE ), but the variable 'thisvar' isn't working. 我已经在下面显示了我所做的事情(这里在FIDDLE中 ),但是变量“ thisvar”不起作用。
I'm obviously missing something really simple - can you point out what it is? 我显然缺少了一些非常简单的东西-您能指出它是什么吗?
Thanks 谢谢
// declare objects
var variant1 = {};
var variant2 = {};
variant1['a'] = 'apple';
variant1['b'] = 'orange';
variant1['c'] = 'pear';
variant2['a'] = 'red';
variant2['b'] = 'green';
variant2['c'] = 'blue';
// run through each object
for (i=1; i<3; i++){
var thisvar = variant+i;
for(var newindex in thisvar) {
var name = newindex;
var contents = thisvar[newindex];
alert(name+'='+contents);
}
}
// declare objects
var container = {
variant1: {}
variant2: {}
}
container.variant1['a'] = 'apple';
container.variant1['b'] = 'orange';
container.variant1['c'] = 'pear';
container.variant2['a'] = 'red';
container.variant2['b'] = 'green';
container.variant2['c'] = 'blue';
// run through each object
for (var i = 1; i < 3; i++){
for (prop in container["variant"+i]){
if (variant.hasOwnProperty(prop)){
alert(prop+'='+var[prop]);
}
}
}
As pointed out in the comments below, if you want to numerically iterate over the properties, you're better off just using an array: 如下面的注释中指出的那样,如果要对属性进行数字迭代,最好只使用数组:
// declare objects
var variants = [{},{}];
variants[0]['a'] = 'apple';
variants[0]['b'] = 'orange';
variants[0]['c'] = 'pear';
variants[1]['a'] = 'red';
variants[1]['b'] = 'green';
variants[1]['c'] = 'blue';
// run through each object
for (var i = 0; i < 2; i++){
for (prop in variants[i]){
if (variant.hasOwnProperty(prop)){
alert(prop+'='+var[prop]);
}
}
}
Try this: 尝试这个:
var variant1 = new Object();
variant1['a'] = 'apple';
variant1['b'] = 'orange';
variant1['c'] = 'pear';
var variant2 = new Object();
variant2['a'] = 'red';
variant2['b'] = 'green';
variant2['c'] = 'blue';
for (i=1; i<3; i++){
var thisvar ;
eval( 'thisvar = variant'+i);
for(var newindex in thisvar) {
var name = newindex;
var contents = thisvar[newindex];
alert(name+'='+contents);
}
}
如果您只想检查对象属性,则只需执行
alert(JSON.stringify(container))
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