jquery 复制文本到剪切板插件（非 flash）

/*!
* jQuery Copy Plugin
* version: 1.0.0-2018.01.23
* Requires jQuery v1.5 or later
* Copyright (c) 2018 Tiac
* http://www.cnblogs.com/tujia/p/8336671.html */

// AMD support
(function (factory) {
"use strict";
if (typeof define === 'function' && define.amd) {
// using AMD; register as anon module
define(['jquery'], factory);
} else {
// no AMD; invoke directly
factory( (typeof(jQuery) != 'undefined') ? jQuery : window.Zepto );
}
}

(function($) {
"use strict";

/*
Basic Usage:
-----------

Html:
<button type="button" class="btn-copy" data-clipboard-text="Copy Me!">Copy</button>
JS:
$('.btn-copy').copy();

Html:
<div class="input-group">
<input type="text" class="form-control inp-link">
<span class="input-group-btn">
<button class="btn btn-primary btn-copy" type="button">Copy</button>
</span>
</div>
JS:
$('.btn-copy').copy({
copy: function(_this){
return _this.parents('div').find('.inp-link').val();
},
afterCopy: function(res){
if(res==true){
alert('Copied text to clipboard。');
}else{
alert('Copy failed！');
}
}
});
*/

var clipboard_text = '';

function copyTextToClipboard(_this, text) {
var oTa = jQuery('<textarea style="position:fixed;left:0;top:0;z-index:9999999999"></textarea>');
oTa.val(text);

_this.after(oTa);

oTa.select();

try {
var result = document.execCommand('copy');
oTa.remove();
return result;
} catch (err) {
console.log(err);
return false;
}
}

$.fn.copy = function(options) {
if(options===undefined) options = {};
var defaults = {};
defaults.copy = function(_this){
clipboard_text = _this.data('clipboard-text');
return clipboard_text;
};

defaults.afterCopy = function(res, _this){
if(res){
console.log('Copied text to clipboard: ' + clipboard_text);
}else{
console.log('Copy failed！');
}
};

options = $.extend(defaults, options);

this.on('click', function(){
clipboard_text = options.copy($(this));
var res = copyTextToClipboard($(this), clipboard_text);
options.afterCopy(res, $(this));
});
};

}));