最后应该是：
<select id="show" class="form-control" name="show_text_area" onchange="change(this)">
function change(obj) {
var select@R_55_2419@ = obj;
var selected = select@R_55_2419@.options[select@R_55_2419@.selectedIndex].value;
var textarea = document.getElementById("text_area");
if(selected === '1'){
textarea.style.display = "block";
}
else{
textarea.style.display = "none";
}
}
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