我们可以使用jQuery的isEmptyObject()方法来检查数组是否为空或包含元素。isEmptyObject()方法接受一个Object类型的单一参数,也就是要检查的对象,如果该对象是空的,返回一个布尔值true,如果不是空的,返回false。语法:$.isEmptyObject(array); HTML Copy例子1:在下面的例子中,我们向isEmptyObject() 方法传递了一个...
Step 4 ? Check the length of an array[ ] using length method in if-else condition. Step 5 ? If the length of the array[ ] is equal to zero then it will return an empty, otherwise if the length of an array is greater than zero then it will return an empty. Example Open Compiler...
使用 PHP 函数对变量 $x 进行比较 表达式gettype()empty()is_null()isset()boolean : if($x) $x...
success:function(result){ $("#weather-temp").html(""+ result +" degrees"); } }); Related Projects jQuery UI This project is in maintenance-only mode.Learn more. jQuery Mobile This project is deprecated.Learn more.
core_trim = core_version.trim, // Define a local copy of jQuery jQuery = function( selector, context ) { // The jQuery object is actually just the init constructor 'enhanced' return new jQuery.fn.init( selector, context, rootjQuery ); }, // Used for matching numbers core_pnum = /...
isArray: Array.isArray||function( obj ) {returnjQuery.type(obj) === "array"; }, isWindow:function( obj ) {//obj.window意思是window.window,前者是全局对象,后者是浏览器窗口returnobj !=null&& obj ==obj.window; }, isNumeric:function( obj ) {//isFinite判断是否为有限的数字return!isNaN(...
Assigning null to an array if array is empty Asynchronous operations are not allowed in this context. Attachment File Path while Sending Email using C# and Gmail Attempt by security transparent method 'System.Web.Mvc.PreApplicationStartCode.Start() attempted to access an unloaded appdomain When rea...
返回true时,findIndex(... return isNaN(value); }) console.log(a); //NaN 方法四:for()或forEach() 循环遍历,然后用if判断方法五:使用jquery...的inArray方法该方法返回元素在数组中的下标,如果不存在与数组中,那么返回-1; var arr=['aaa','bbb','ccc','ddd','eee']; var a= $.inArray...
// To prevent the for loop in the first place assign an empty array // in case there are no cookies at all. Also prevents odd result when // calling $.cookie(). var cookies = document.cookie ? document.cookie.split('; ') : []; ...
[]; if($.isEmptyArray(data)) return ids; for(var i = 0; i < data.length; i++){ ids.push(data[i][this.primaryKey]); } return ids; }, view: function(curDom, event){ var _self = this; var data = _self.getSelectRows(); if (data.length != 1) { layer.msg("请选中一...