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$("#tab_t li a").on("mousedown", function () {
$(this).setCapture();
}).on("mouseup", function () {
alert("松开鼠标成功!");
<a href="javascript:void(0)"> </a>
// element.onmousedown 的时候
element.setCapture ? element.setCapture() : window.captureEvents(Event.MOUSEMOVE|Event.MOUSEUP);
//element.onmouseup 的时候
element.releaseCapture ? element.releaseCapture() : window.releaseEvents(Event.MOUSEMOVE|Event.MOUSEUP);