style.left在IE的FF中注意

IE:
document.getElementById("jqContextMenu").style.left = event.clientX;
document.getElementById("jqContextMenu").style.top = event.clientY;

IE和FF兼容:
document.getElementById("jqContextMenu").style.left = event.clientX + "px";
document.getElementById("jqContextMenu").style.top = event.clientY + "px";

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