elem.setAttribute("unselectable" , "on");
elem.style.MozUserSelect = 'none';
elem.style.WebkitUserSelect = 'none';
elem.setAttribute('unselectable' , 'off');
elem.style.MozUserSelect = '';
elem.style.WebkitUserSelect = '';
ie 和 opera 用 unselectable on
firefox用 MozUserSelect none
safari,chrome用WebkitUserSelect none
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