jQuery 通用工具
2018-07-25 14:18 更新
- $.each() $.map()
- 遍历列表, $.map() 可以作用于对象。
$.each([52, 97], function(index, value) { alert(index + ': ' + value); }); $.map( [0,1,2], function(index, n){ return n + 4; }); //[4, 5, 6] $.map( [0,1,2], function(n){ return n > 0 ? n + 1 : null; }); //[2, 3] $.map( [0,1,2], function(n){ return [ n, n + 1 ]; }); //[0, 1, 1, 2, 2, 3] var dimensions = { width: 10, height: 15, length: 20 }; $.map( dimensions, function( value, key ) { return value * 2; }); //[20, 30, 40] var dimensions = { width: 10, height: 15, length: 20 }, $.map( dimensions, function( value, key ) { return key; }); //["width", "height", "length"]
- $.extend()
- 合并对象,第一个参数表示是否进行递归深入
var object = $.extend({}, object1, object2); var object = $.extend(true, {}, object1, object2);
- $.merge()
- 合并列表
$.merge( [0,1,2], [2,3,4] ) //[0,1,2,2,3,4]
- $.grep()
- 过滤列表,第三个参数表示是否为取反
$.grep( [0,1,2], function(array,index){ return n > 0; }); //[1,2] $.grep( [0,1,2], function(array,index){ return n > 0; }, true); //[0]
- $.inArray()
- 存在判断
$.inArray( value, array [, fromIndex] )
- $.isArray() $.isEmptyObject() $.isFunction() $.isNumeric() $.isPlainObject()$.isWindow() $.isXMLDoc()
- 类型判断
- $.noop()
- 空函数
- $.now()
- 当前时间戳,值为 (new Date).getTime()
- $.parseJson() $.parseXML()
- 把字符串解析为对象
var xml = "<rss version='2.0'><channel><title>RSS Title</title></channel></rss>", xmlDoc = $.parseXML( xml ), $xml = $( xmlDoc ), $title = $xml.find( "title" );
- $.trim()
- 去头去尾, $.trim(str)
- $.type()
- 判定参数的类型
# If the object is undefined or null, #then "undefined" or "null" is returned accordingly. * jQuery.type(undefined) === "undefined" * jQuery.type() === "undefined" * jQuery.type(window.notDefined) === "undefined" * jQuery.type(null) === "null" # If the object has an internal [[Class]] equivalent to #one of the browser's built-in objects, the associated name is returned. #(More details about this technique.) * jQuery.type(true) === "boolean" * jQuery.type(3) === "number" * jQuery.type("test") === "string" * jQuery.type(function(){}) === "function" * jQuery.type([]) === "array" * jQuery.type(new Date()) === "date" * jQuery.type(/test/) === "regexp"
- $.unique()
- 遍历后去重, $.unique(array)
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