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var myArray=['a','b','c','d','e','f'];
var n = myArray.indexOf("d");
if(n!=-1)
myArray.splice(n,1);
alert(myArray);
<script type="text/javascript">
var myArray=['a','b','c','d','e','f'];
document.write(myArray + "<br />");
for(var i=0;i<=myArray.length-1;i++){
if(myArray[i]=='b'||myArray[i]=='d'){
myArray.splice(i,1);
}
}
document.write(myArray + "<br />");
</script>