实用Javascript代码片段

清除select下拉选项，添加并选择特点选项

$('#mySelect')
.find('option')
.remove()
.end()
.append('<option value="whatever">text</option>')
.val('whatever')
;

为字符串添加endsWith的方法

String.prototype.endsWith = function(suffix) {
return this.indexOf(suffix, this.length - suffix.length) !== -1;
};

同理，字符串startsWith方法

if (typeof String.prototype.startsWith != 'function') {
// see below for better implementation!
String.prototype.startsWith = function (str){
return this.indexOf(str) === 0;
};
}

为数组添加remove方法

// Array Remove - By John Resig (MIT Licensed)
Array.prototype.remove = function(from, to) {
var rest = this.slice((to || from) + 1 || this.length);
this.length = from < 0 ? this.length + from : from;
return this.push.apply(this, rest);
};

判断HTML元素是否有子元素

if ( $('#myfav').children().size() > 0 ) {
// do something
}

if ($('#myfav').is(':parent')) {
// do something
}