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<apex:form>
                    <apex:inputText id="txtName" value="{!name}" label="Input"/>
  </apex:form>

<script>
  var txtName = document.getElementById('txtName');
  txtName.value='abc';
</script>

Occur error: Uncaught TypeError: Cannot set property 'value' of null
How can set value to apex:inputText from javascript?