[英]JavaScript for loop adding objects to objects
I have an array (data) formatted like so: 我有一个格式如下的数组(数据):
["1", "open_order", "form", "county", "San Diego", "title_officer", "Peter", "0"] ["2", "open_order", "form", "county", "San Diego", "branch", "MV", "0"]
When I put this through a for loop and add it to the dataObject, console.log(dataObject) gives me all of the entries (this is what I want!) However, console.log(o) shows that the last entry is going into the o object for both records. 当我将其放入for循环并将其添加到dataObject时,console.log(dataObject)会给我所有条目(这就是我想要的!)。console.log(o)显示最后一条条目正在放入两个记录的o对象。
$(function() { var o = {}; var dataObject = {}; var i = 0; var predata = $('#preferences').text(); var data = JSON.parse(predata); for(i = 0; i < data.length; i++) { dataObject['preferenceId'] = data[i][0]; dataObject['pageName'] = data[i][1]; dataObject['preferenceType'] = data[i][2]; dataObject['baseField'] = data[i][3]; dataObject['baseValue'] = data[i][4]; dataObject['targetField'] = data[i][5]; dataObject['targetValue'] = data[i][6]; dataObject['conditionalId'] = data[i][7]; o[i] = dataObject; console.log(dataObject); } console.log(o); });
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
Any ideas why dataObject would be the same for all objects added to the o object? 有什么想法为什么dataObject对于添加到o对象的所有对象都是相同的?
You should init the dataObject
inside the loop to make a new variable. 您应该在循环内初始化dataObject
以创建新变量。
for(i = 0; i < data.length; i++) {
var dataObject = {}; /* Init the variable here */
dataObject['preferenceId'] = data[i][0];
dataObject['pageName'] = data[i][1];
dataObject['preferenceType'] = data[i][2];
dataObject['baseField'] = data[i][3];
dataObject['baseValue'] = data[i][4];
dataObject['targetField'] = data[i][5];
dataObject['targetValue'] = data[i][6];
dataObject['conditionalId'] = data[i][7];
o[i] = dataObject;
onsole.log(dataObject);
}
This will result to: 这将导致:
0: {
baseField: "county",
baseValue: "San Diego",
conditionalId: "0",
pageName: "open_order",
preferenceId: "1",
preferenceType: "form",
targetField: "title_officer",
targetValue: "Peter"
}
1: {
baseField: "county",
baseValue: "San Diego",
conditionalId: "0",
pageName: "open_order",
preferenceId: "2",
preferenceType: "form",
targetField: "branch",
targetValue: "MV",
}
The reason why all of the values on the final array is the same is that, you are just assigning the dataObject
by reference and you are not making a new variable. 最终数组上的所有值都相同的原因是,您只是通过引用分配dataObject
,而没有创建新变量。
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