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isPlainObject
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta http-equiv="content-type" content="text/html;charset=utf-8"/> | |
| <title>isPlainObject</title> | |
| <style> | |
| li.PASS { background: green; } li.FAIL { background: red; } | |
| iframe { display: none; } | |
| </style> | |
| </head> | |
| <body> | |
| <ul id="results"></ul> | |
| <script> | |
| var jQuery = jQuery || { expando: "jQuery123456789" }; | |
| ;(function(){ | |
| var o = {}, | |
| toString = o.toString, | |
| hasOwn = o.hasOwnProperty, | |
| lastOwn = jQuery.expando + ':lastOwnProperty', | |
| undefined; | |
| var isObjectPrototype = hasOwn ? | |
| function( obj ) { | |
| return hasOwn.call( obj, "isPrototypeOf" ); | |
| } : | |
| function( obj ) { | |
| var isPrototypeOf = obj.isPrototypeOf; | |
| if ( isPrototypeOf ) { | |
| if ( !( delete obj.isPrototypeOf ) ) { | |
| return true; | |
| } | |
| if ( !obj.isPrototypeOf ) { | |
| obj.isPrototypeOf = isPrototypeOf; | |
| return true; | |
| } | |
| } | |
| return false; | |
| }; | |
| jQuery.isPlainObject = function( obj ) { | |
| // Must be an Object. | |
| // Make sure that DOM nodes and window objects don't pass through, as well | |
| if ( !obj || toString.call(obj) !== "[object Object]" || obj.nodeType || obj.setInterval ) { | |
| return false; | |
| } | |
| // If it look as an instance, then it must be an Object instance. | |
| if ( obj.constructor && | |
| obj.constructor.prototype && | |
| obj.constructor.prototype.isPrototypeOf( obj ) && | |
| !isObjectPrototype(obj.constructor.prototype) ) { | |
| return false; | |
| } | |
| // Also we have to check that all enumerable properties are own. | |
| // Own properties are enumerated firstly, | |
| // so if last one is own, then all others are own too. | |
| if ( !hasOwn ) { | |
| obj[ lastOwn ] = true; | |
| } | |
| // Get last enumerable property. | |
| var prop; | |
| for ( prop in obj ) {} | |
| if ( hasOwn ) { | |
| return prop === undefined || hasOwn.call( obj, prop ); | |
| } else { | |
| delete obj[ lastOwn ]; | |
| return prop === lastOwn; | |
| } | |
| } | |
| })(); | |
| if ( ({}).hasOwnProperty ) { | |
| log("Uses hasOwnProperty"); | |
| } | |
| (function(){ | |
| // Enumerating in order? | |
| var m, str = document.body.innerHTML, | |
| obj = {}, arr = [], i = 0; | |
| while (( m = /[\s\S]{10}/g.exec(str) )) { | |
| if ( !obj[ m[0] ] ) { | |
| obj[ m[0] ] = true; | |
| arr.push( m[0] ); | |
| } | |
| } | |
| for ( var prop in obj ) { | |
| if ( !prop === arr[i++] ) { | |
| var pass = ({}).hasOwnProperty ? "INFO" : "FAIL"; | |
| log("Enumerating properties out of inserting order", pass); | |
| break; | |
| } | |
| } | |
| })(); | |
| // Function serialization is not permitted | |
| // Does not work across all browsers | |
| Function.prototype.toString = function(){}; | |
| // The use case that we want to match | |
| test("{}", {}, true); | |
| // Instantiated objects shouldn't be matched | |
| test("new Date", new Date, false); | |
| var fn = function(){}; | |
| // Functions shouldn't be matched | |
| test("fn", fn, false); | |
| // Again, instantiated objects shouldn't be matched | |
| test("new fn (no methods)", new fn, false); | |
| // Makes the function a little more realistic | |
| // (and harder to detect, incidentally) | |
| fn.prototype = {someMethod: function(){}}; | |
| // Again, instantiated objects shouldn't be matched | |
| test("new fn", new fn, false); | |
| test("div", document.createElement("div"), false ); | |
| /* Note: | |
| * The restriction against instantiated functions is | |
| * due to the fact that this method will be used for | |
| * deep-cloning an object. Instantiated objects will | |
| * just have their reference copied over, whereas | |
| * plain objects will need to be completely cloned. | |
| */ | |
| var iframe = document.createElement("iframe"); | |
| document.body.appendChild(iframe); | |
| var doc = iframe.contentDocument || iframe.contentWindow.document; | |
| doc.open(); | |
| doc.write("<body onload='window.top.iframeDone(Object);'>"); | |
| doc.close(); | |
| function iframeDone(otherObject){ | |
| // Objects from other windows should be matched | |
| test("new otherObject", new otherObject, true); | |
| } | |
| function test(msg, a, b) { | |
| var pass = jQuery.isPlainObject(a) === b ? "PASS" : "FAIL"; | |
| log( msg, pass ); | |
| } | |
| function log(msg, cls) { | |
| document.getElementById("results").innerHTML += | |
| "<li class='" + ( cls || "INFO" ) + "'>" + msg + "</li>"; | |
| } | |
| </script> | |
| </body> | |
| </html> |
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