js里获取input的值吗

<input type="text" id="myInput">
<button onclick="getValue()">获取值</button>

<script>
function getValue() {
    var inputValue = document.getElementById('myInput').value;
    console.log(inputValue);
}
</script>

<input type="text" name="myInput">
<button onclick="getValueByName()">获取值</button>

<script>
function getValueByName() {
    var inputs = document.getElementsByName('myInput');
    for (var i = 0; i < inputs.length; i++) {
        console.log(inputs[i].value);
    }
}
</script>

<input type="text" class="myInput">
<button onclick="getValueByQuery()">获取值</button>

<script>
function getValueByQuery() {
    var inputValue = document.querySelector('.myInput').value;
    console.log(inputValue);
}
</script>

window.onload = function() {
    // 你的代码
};

var inputValue = document.getElementById('myInput').value;
var numberValue = parseFloat(inputValue); // 将字符串转换为数字