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After unbinding first, bind sometimes fails. Some business requirements no longer need to be bound, and some need to be re-bound.
The following is a simple example

window.onload=function(){
   $("input").unbind();
}            
$("input").bind("click",function(){
   alert("1");
})

This cannot be rebinded

Written like this, you can bind

        $("input").unbind();
        $("input").bind("click",function(){
            alert("1");
        })

Ask the reason for this problem? Expert analysis