select下拉框之去掉重复

window.onload =function(){

select1();

select2();

}

function select1() {

var opts = document.getElementById('add_stdevice_code').options;

var obj = new Object(), index = 0;

while (index < opts.length) {

if (opts[index].text in obj) opts[index] = null;

else {

obj[opts[index].text] = opts[index].text;

index++;

}

}

obj = null;

}

function select2() {

var opts = document.getElementById('add_stdevice_stcd').options;

var obj = new Object(), index = 0;

while (index < opts.length) {

if (opts[index].text in obj) opts[index] = null;

else {

obj[opts[index].text] = opts[index].text;

index++;

}

}

obj = null;

}