判断 function checkString() { var inputString = $("#inputString").val(); if (inputString === "") { console.log("字符串为空"); } else { console.log("字符串不为空"); } } 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22....
Returning an Empty Set Calling thejQuery()method withno argumentsreturns an empty jQuery set (with a.lengthproperty of 0). Similarly, if an argument ofnull,undefined, an empty array ([]), or an empty string ("") is passed, the set contains no elements. ...
Utilities jQuery.isEmptyObject() Check to see if an object is empty (contains no enumerable properties).Deprecated > Deprecated 3.3 | Utilities jQuery.isFunction() Determines if its argument is callable as a function.Deprecated > Deprecated 3.3...
The only valid values for boolean content attributes are empty string or the full attribute name (e.g. checked="checked").jQuery has historically tried to be helpful here and treated boolean attributes in a special way in the .attr() API:...
Can be called with an empty string and minLength: 0 to display all items. value Type: String Code examples: Invoke the search method: 1 $( ".selector" ).autocomplete( "search", "" ); widget()Returns: jQuery Returns a jQuery object containing the menu element. Although the menu ...
Jquery例子1_占位符使用 需求: 点击第一个按钮后 自动去check 后面是否有按钮没有选中, 如有则提示错误消息. 代码语言:javascript 代码运行次数:0 运行 AI代码解释 function check() { String.prototype.format = function(){ var args = arguments; return this.replace(/\{(\d+)\}/g, function(m,i...
23 String.prototype.trim = function() { 24 var str = this; 25 str = str.match(/\S+(?:\s+\S+)*/); 26 return str ? str[0] : ''; 27 } 28 // match 是返回一个数组,因此原字符串符合要求的部分就成为它的元素。为了防止字符串中间的空白符被排除,我们需要动用到非捕获性分组(?:exp...
Note: If serialize returns an empty string, make sure the id attributes include an underscore. They must be in the form: "set_number" For example, a 3 element list with id attributes "foo_1", "foo_5", "foo_2" will serialize to "foo[]=1&foo[]=5&foo[]=2". You can use an ...
jQuery.fn.extend({//入队//源码4663行//'type', function(){xxx}queue:function(type,data){varsetter=2;if(typeoftype!=="string"){data=type;type="fx";setter--;}//如果参数小于setter,就执行jQuery.queue()方法/*这边就是getter*/if(arguments.length<setter){//this[0] 目标DOM元素//type "typ...
Step 3 ? Create an empty array as arr[ ]. 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...