eval str

First, the variable typeThe value that the variable is stored in memory. This means that there is a space in memory when creating variables.Based on the data type of the variable, the interpreter allocates the specified memory and determines what

From how the browser compiles the JS code.I've been thinking for a long time, when we give the code to the browser, how the browser transforms the code into a vivid Web page. JS engine before executing our code, what the browser did to our code, the

I. Conversion of JSON objects to JSON strings1.How the jquery plugin supports conversion :$.parsejson (JSONSTR); Jquery.parsejson (JSONSTR), you can convert a JSON string into a JSON object2. browser supported conversion Mode

Nine. Operators1. Arithmetic Operators operator Description Example + Add Two objects added a + B output result 30 - Reducing Get negative numbers or a number minus

Recently began to review the use of Python, the server operations commonly used modules of the use of the instantiation of the overview.==========sort=========================python  sort; Ls=[1,31,13,141,41]ls.sort () Print ls tuple sort:>> > lst=[(

Javascript Small brackets have 5 semanticsSemantic 1: Parameter table when function declaration1 function func (arg1, arg2) {2//...3}Semantic 2: Used in conjunction with some statements to achieve certain qualifiers1//And for use2 for (var a in obj)

Python various types of conversionsStudied: 79204008547818int (x [, Base]) converts x to an integer long (x [, Base]) converts X to a long integer, float (x) converts x to a floating-point number complex (real [,

Python supports four different numeric types: Integer (Int) -usually referred to as an integer or integral, is a positive or negative integer, with no decimal points. long integers -an integer with an infinite size, and an integer that

Basic data types for Python3 Variables do not need to be declared in advance Each variable must be assigned before it can be created after assignment. In Python, a variable is of no type, and the word "type" here refers to the type

1, the Eval method analysis, I am afraid this is the earliest analytic way. As follows:functionvar json = eval (' (' + str + ') 'return '2, new function form, more strange oh. As follows:functionvar json = (new function ("return" +return3. Use the

JSON (JavaScript Object Notation) is a lightweight data interchange format that is ideal for data interchange formats in a completely language-independent text format. At the same time, JSON is a native JavaScript format, which means that working

Data type Numbers (number) int-signed integer/long-long integer/float-float/complex-Complex String (String) List (lists) [] Tuple (tuple) () Dictionary (dictionary) {} Data type conversionsNumber: Int (x), Long (x),

Convert string encoding to Unicode encodingfunction Chartounicode (str) {let temp; Let i = 0; Let r = '; Let len = str.length; for (; i 　　Unicode encoding to string encodingfunction Unicodetochar (str) { //scheme one return eval ("

First, help　If you want to know more about an object, you can call Help (object)! There are also some useful ways that Dir (object) will display most of the relevant property names for that object, and Object._ Doc _ will display its corresponding

For example, the JSON string inside the database is like this 12345 varstr = ‘[{"name":"宗2瓜","num":"1","price":"122"},{"name":"宗呱呱","num":"1","price":"100"}]‘;var xqo = eval(‘(‘ + str + ‘)‘);for(var i inxqo){　　alert(xqo[i].name);

One, JSON string converted to JSON objectTo use the above str1, you must first convert to a JSON object using the following method:Convert from JSON string to JSON objectvar obj = eval (' (' + str + ') ');Orvar obj = Str.parsejson (); Convert from

JSON (JavaScript Object Notation) is a lightweight data format that uses completely language-independent text formats and is an ideal data interchange format. At the same time, JSON is a native JavaScript format, which means that working with JSON

As you know, jquery has a serialize method that serializes a form into a "&" concatenated string, but does not provide a way to serialize to JSON. However, we can write a plugin implementation.I saw on the internet that someone replaced the & with a

The JSON text format is syntactically identical to the code that creates the JavaScript object.Because of this similarity, the JavaScript program can use the built-in eval () function to generate native JavaScript objects with JSON data without a

JS Operation JSON SummaryJSON (JavaScript Object Notation) is a lightweight data interchange format that is ideal for data interchange formats in a completely language-independent text format. At the same time, JSON is a native JavaScript format,