'for(var value in user)方法我用过, 不行! '这样:
<script type="text/javascript">
Object.prototype.c = 'c';var x = function(){
this.a = 'a';
this.b = 'b';
}var y = new x();for(var i in y){
if(y.hasOwnProperty(i)){
document.write(i+'<br/>');
}
}
</script>
<script type="text/javascript">
Object.prototype.c = 'c';var x = function(){
this.a = 'a';
this.b = 'b';
}var y = new x();for(var i in y){
if(y.hasOwnProperty(i)){
document.write(i+'<br/>');
}
}
</script>
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