怎么禁止checkbox选项框为只读,类似<input type="text" readonly>的效果。readonly对chec

怎么禁止checkbox选项框为只读,类似

1<input readonly="" type="text"/>

的效果。readonly对checkbox不起作用。使用disabled会使该选项值也无效。谢谢!
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1<input onclick="this.checked=!this.checked" type="checkbox"/>

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1<input onclick="if(this.checked)this.checked=false" type="checkbox"/>

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1<input name="frm" onclick="event.returnValue=false;" type="checkbox" value="1"/>

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1<input checked="" onclick="this.checked=!this.checked" type="checkbox"/>
1<input checked="" onclick="return false" type="checkbox"/>
1<span onmouseout="firstChild.disabled=false" onmouseover="firstChild.disabled=true"><input checked="" type="checkbox"/></span>
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