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
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The execution order is different. The unbind in onload is executed after the bind below, so you bind first, then unbind after onload
You bound a click event to the input, but the click event was removed from your window.onload