Conversion between json objects and string objects in JavaScript_javascript skills

json object

Copy code The code is as follows:

var json = { aa:true,bb:true};
var json1 = {aa:'b',bb:{cc:true,dd:true}};

1: js Manipulate json object

Copy code The code is as follows:

for(var item in json ){
alert(item); //The result is aa, bb, the type is string
alert(typeof(item));
alert(eval("json." item)); //The result is true, the true type is boolean
eval(("json." item "=false;")); //Change the value of the json object
}

2 : Method to convert json object into String object

Copy code The code is as follows:

/**
* json object to string format
*/
function json2str(o) {
var arr = [];
var fmt = function(s) {
if (typeof s == 'object' && s != null) return json2str(s);
return /^(string|number)$/.test(typeof s) ? "'" s "'" : s;
}
for ( var i in o) arr.push("'" i "':" fmt(o[i]));
return '{' arr.join(',') '}';
}

3: Convert string object to json object

Copy code The code is as follows :

function stringToJson(stringValue)
{
eval("var theJsonValue = " stringValue);
return theJsonValue;
}

4: Method to convert json array into String object (requires the above method)

Copy code The code is as follows:

function JsonArrayToStringCfz(jsonArray)
var JsonArrayString = "[";
for(var i=0;i JsonArrayString=JsonArrayString JsonToStringCfz(jsonArray[i]) ",";
}
JsonArrayString = JsonArrayString.substring(0,JsonArrayString.length-1) "]";
return JsonArrayString;
}

5: Use json.js json to string

Copy code Code As follows:

<script> <br>var date = {myArr : ["a" , " b" , "c" , "d"] , count : 4}; <br>var str = JSON.stringify(date); <br>alert(str); <br></script>