js获取input元素文本

// HTML
<input type="text" id="myInput" value="Hello World">

// JavaScript
var inputElement = document.getElementById('myInput');
var inputValue = inputElement.value;
console.log(inputValue); // 输出: Hello World

// HTML
<input type="text" class="myClass" value="First">
<input type="text" class="myClass" value="Second">

// JavaScript
var inputElements = document.getElementsByClassName('myClass');
for (var i = 0; i < inputElements.length; i++) {
    console.log(inputElements[i].value);
}
// 输出:
// First
// Second

// JavaScript
var inputs = document.getElementsByTagName('input');
for (var i = 0; i < inputs.length; i++) {
    console.log(inputs[i].value);
}

// 获取单个元素
var singleInput = document.querySelector('#myInput');
console.log(singleInput.value);

// 获取多个元素
var multipleInputs = document.querySelectorAll('.myClass');
multipleInputs.forEach(function(input) {
    console.log(input.value);
});

window.onload = function() {
    var inputElement = document.getElementById('myInput');
    console.log(inputElement.value);
};