Practical Skill of java script

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1. 'with' statement:  with (object){statement} . The statement can add object to head of domain link, and then excute statement, and restore domain link after that.
   Such as :  with (frame[1].document.forms[0]){
   name.value="";
   address.value="";
   email.value="";
   Thus it decrease input of code, for no need add prefix frames[1].document.forms[0] before each form attribute. 
2. ss