Standard JavaScript code specification detailed

1. JavaScript code should conform to Douban-jslint inspection standard

1-1. Statements must have a semicolon ending, except for, function, if, switch, try, while

1-2. Only long statements can consider breaking, such as:

The code is as follows	Copy Code
Templ_songlist.replace (' {TABLE} ', da[' results ']) . replace (' {prev_num} ', PREV) . replace (' {next_num} ', NEXT) . replace (' {current_num} ', current) . replace (' {total_num} ', da.page_total);

To avoid conflict with the jslint test mechanism, "." or "+" such operators put at the end of the line, the above code should read:

The code is as follows	Copy Code
Templ_songlist.replace (' {TABLE} ', da[' results ']). Replace (' {prev_num} ', PREV). Replace (' {next_num} ', NEXT). Replace (' {current_num} ', current). Replace (' {total_num} ', da.page_total);

1-3. Avoid extra commas. such as: var arr = [1,2,3,];

1-4. All circulation bodies and judgments need to be enclosed in "{}". Such as:

The code is as follows	Copy Code
Wrong: if (condition) Statement Or if (condition) statement; Right: if (condition) { Statement Or if (condition) {statement;}

The 1-5. For-in loop body must use the hasOwnProperty method to check whether a member is a member of its own. Avoid contamination from the prototype chain.

1-6. Variable declaration. Variable declarations should be placed at the top of the function. Avoid using undeclared variables.

The code is as follows	Copy Code
Wrong: if (n > 0) { var isvalid = true; Right: var IsValid; if (n > 0) { IsValid = true; }

1-7. Do not use with, void, evil.

1-8. The use of strict condition-judging characters. Use = = = instead of = =, replace!= with!==.

1-9. The following types of objects are not recommended for new constructs: New number, new String, new Boolean, new object (with {} instead), New Array (with [] instead).

1-10. Reference object members use OBJ.PROP1 instead of obj["Prop1", unless the property name is a variable.

Note: Douban-jslint is a custom jslint

Note: If you use other global variables to skip JSLint checks in the module code, you can add a declaration to the file, such as:

2. JavaScript naming rules

2-1. The first letter of the constructor is capitalized. Such as:

code is as follows	copy code
function Dialog (config) {                              statement;                          }                           var dlg = new Dialog ({...});

2-2. The object's properties or method names are used in small hump style (lower camel-case), such as "Init", "bindevent", "updateposition":

The code is as follows	Copy Code
Dialog.prototype = {                             Init:function ( ) {},                             bindevent:function () {},                              updateposition:function () {}                          };

2-3. The private variable name begins with an underscore. such as: "_current", "_defaultconfig"

2-4. The constant name is all uppercase and the words are separated by an underscore. such as: "Css_btn_close", "txt_loading"

2-5. Prefix of variable name:

The code is as follows	Copy Code
Prefix Element Example Integer Nvariablename I,j,k,m,n, etc. * Integer as Counter/iterator (For i=0 i<=oarray.length; i++) String Svariablename Object Oobjectname Is, can, has Boolean [Boolean name] ConditionName Event method Event attachment [Event Type]_methodname Accessor method Getmethodname Accessor method Setmethodname Note:only a counter/iterator should use a single-letter designation.

3. Code Formatting requirements

3-1. Necessary spaces and indents in the statement

3-1-1. Use a space before and after the "()" that contains the statement, such as: If/for/while/switch (statements) {...}

3-1-2. "=" need to be preceded by a space

3-1-3. "," after the array member needs to be followed by a space

Not good:

The code is as follows	Copy Code
For (t in selected) {if (!hash[t]) deselect (t)}

Good:

The code is as follows	Copy Code
For (t in selected) { if (!hash[t]) { Deselect (t); }

3-2. Long statements using break line:

Not good:

Templ_songlist.replace (' {TABLE} ', da[' results ']). Replace (' {prev_num} ', PREV). Replace (' {next_num} ', NEXT). Replace ( ' {current_num} ', current '. Replace (' {total_num} ', da.page_total);

Good:

The code is as follows	Copy Code
Templ_songlist.replace (' {TABLE} ', da[' results ']). Replace (' {prev_num} ', PREV). Replace (' {next_num} ', NEXT). Replace (' {current_num} ', current). Replace (' {total_num} ', da.page_total);

3-3. Format Object Parameters:

Not good:

The code is as follows	Copy Code
embedSWF (ID, {URL: '/swf/player30792.swf?url= ' + el.href, width:261, height:30, params: {wmode: ' Transparent '}, attrib Utes: {ID: "player-sample" + I, Name: "Player-sample" + I}});

Good:

The code is as follows	Copy Code
embedSWF (ID, { URL: '/swf/player30792.swf?url= ' + el.href, width:261, Height:30, Params: {wmode: ' Transparent '}, Attributes: { ID: "Player-sample" + I, Name: "Player-sample" + i});