JavaScript 清除文本字段的默认值，并返回原始值

Posted 2021-05-20

// A simple, lightweight, on-the-fly script to handle the clearing and resetting of a text field
var searchField = document.getElementById('search');
var defaultText = searchField.value;
searchField.onfocus = function(){
    if( searchField.value == defaultText ){
        searchField.value = '';
    }
};
searchField.onblur = function(){
    if( searchField.value == '' ){
        searchField.value = defaultText;
    }
};