how to tell whether input is being entered or deleted
how to tell whether input is being entered or deleted
1, to judge the change, input is an increase in the number of words, deletion is a decrease in the number of words. The bidirectional binding of
2 and defineProperty is actually used to judge the number of words, but this lower version of IE does not support
<body >
<input type="text">
<div></div>
<script>
let dom = document.getElementsByTagName('input')[0];
let value = dom.value;
dom.oninput=()=>{
let new_value = dom.value;
if(value.length<new_value.length){
document.getElementsByTagName('div')[0].innerHTML = "";
}else{
document.getElementsByTagName('div')[0].innerHTML = "";
}
value = new_value;
}
</script>
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