js 文档的高度

var documentHeight = document.documentElement.scrollHeight;
console.log("Document Height:", documentHeight);

var documentHeight = document.body.scrollHeight;
console.log("Document Height:", documentHeight);

var viewportHeight = window.innerHeight;
console.log("Viewport Height:", viewportHeight);

var clientHeight = document.documentElement.clientHeight;
console.log("Client Height:", clientHeight);

function getDocumentHeight() {
    return Math.max(
        document.body.scrollHeight, document.documentElement.scrollHeight,
        document.body.offsetHeight, document.documentElement.offsetHeight,
        document.body.clientHeight, document.documentElement.clientHeight
    );
}

var documentHeight = getDocumentHeight();
console.log("Document Height:", documentHeight);

function updateDocumentHeight() {
    var documentHeight = getDocumentHeight();
    console.log("Updated Document Height:", documentHeight);
}

// 假设内容变化后调用此函数
updateDocumentHeight();