Ajax responseText parses json data case study

Solve the problem that the responseText returned by the server after ajax processing is JSON data.

First, the contents of the file in json format are as follows:

{
    "city":"ShangHai",  
    "telephone":"123456789"
}

Second, the json data returned by the server is the above content in responseText. Now we need to get it out. There are two ways:

Method 1:

var json = JSON.parse(request.responseText);  

alert(json.city);

Method 2:

var result = request.responseText;  

var jsonObject = eval("("+result+")");  

alert(jsonObject.telephone);

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