Summary of Json string usage methods

This time I will bring you a summary of how to use JsonString, what are the Notes when using Json string, the following is a practical case, let’s take a look.

The following will introduce three methods of parsing json strings used in daily life

1. First, let’s take a look at what json format string data is. It is very simple, it is a json string. Transformation, adding odd/even numbers to the json to turn it into string data

 var str='{"name":"Mike","sex":"女","age":"29"}';
 var t2="[{name:'lisi',age:'30'},{name:'wangwu',age:'16'},{name:'tianqi',age:'7'}] "；

2. We use Object.prototype.toString.call() to detect the data type

 console.log(Object.prototype.toString.call(str));//[object String]
 console.log(Object.prototype.toString.call(t2));//[object String]

The first method: evel();

Features: Low security, not recommended, single JSON object is required Add parentheses, JSON array is no longer needed

Example:

var evajson =eval('('+str+')');
var evajsarr = eval(t2);

After conversion, use Object.prototype.toString.call() to detect the converted data type

console.log(Object.prototype.toString.call(evajso))//[object Object]
console.log(Object.prototype.toString.call(evajsarr))//[object Array]

Second type: new Function()

Note: The function must have a return, so "return" must be added;

Example:

var fnjson = new Function("return"+str)();
 var fnjsonArr = new Function("return"+t2)();

After conversion, use Object.prototype.toString.call() to detect the converted data type

console.log(Object.prototype.toString.call(fnjson ))//[object Object]
console.log(Object.prototype.toString.call(fnjsonArr ))//[object Array]

The third method: JSON.parse()

Features: Mainstream, good compatibility, recommended

Example:

 var parjson = JSON.parse(str); 
 var parjson = JSON.parse(t2);

Detect the converted data type

 console.log(Object.prototype.toString.call(parjson ))//[object Object]
 console.log(Object.prototype.toString.call(parjson ))//[object Array]

Believe it After reading the case in this article, you have mastered the method. For more exciting information, please pay attention to other related articles on the PHP Chinese website!

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