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var arr=['A','B','C','D']
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//自定义索引
var oDiv2=document.getElementById("div2");
var oBtn=oDiv2.getElementsByTagName("input");
var arrCity=['北京','上海','合肥']
for(var i=0;i<oBtn.length;i++){
oBtn[i].index=i;//自定义索引
oBtn[i].onclick=function(){
this.value=arrCity[this.index];
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}
}
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