{"id":169163,"date":"2024-05-08T16:39:57","date_gmt":"2024-05-08T08:39:57","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/169163.html"},"modified":"2024-05-08T16:40:01","modified_gmt":"2024-05-08T08:40:01","slug":"javascript-%e5%a6%82%e4%bd%95%e9%98%bb%e6%ad%a2%e8%a1%a8%e5%8d%95%e6%8f%90%e4%ba%a4","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/169163.html","title":{"rendered":"JavaScript \u5982\u4f55\u963b\u6b62\u8868\u5355\u63d0\u4ea4"},"content":{"rendered":"<p style=\"text-align:center\"><img decoding=\"async\" src=\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/27035539\/5ef9023d-57ba-4951-af50-db67b15206f4.webp\" alt=\"JavaScript \u5982\u4f55\u963b\u6b62\u8868\u5355\u63d0\u4ea4\" \/><\/p>\n<p><p><strong>JavaScript\u963b\u6b62\u8868\u5355\u63d0\u4ea4<\/strong>\u7684\u5e38\u89c1\u65b9\u6cd5\u5305\u62ec\u4f7f\u7528<code>event.preventDefault()<\/code>\u3001\u8fd4\u56de<code>false<\/code>\u503c\u5728<code>onsubmit<\/code>\u4e8b\u4ef6\u5904\u7406\u5668\u4e2d\u3001\u4ee5\u53ca\u4f7f\u7528<code>addEventListener<\/code>\u6765\u6ce8\u518c\u4e8b\u4ef6\u3002\u5176\u4e2d\uff0c\u4f7f\u7528<code>event.preventDefault()<\/code>\u662f\u6700\u5e38\u89c1\u548c\u63a8\u8350\u7684\u65b9\u6cd5\uff0c\u56e0\u4e3a\u5b83\u4e0d\u4ec5\u53ef\u4ee5\u963b\u6b62\u8868\u5355\u7684\u9ed8\u8ba4\u63d0\u4ea4\u884c\u4e3a\uff0c\u540c\u65f6\u4e5f\u662f\u73b0\u4ee3DOM\u4e8b\u4ef6\u5904\u7406\u4e2d\u7684\u6807\u51c6\u505a\u6cd5\u3002\u8fd9\u79cd\u65b9\u6cd5\u5141\u8bb8\u4e8b\u4ef6\u5148\u6309\u7167\u4e8b\u4ef6\u6d41\u4f20\u64ad\uff0c\u53ef\u4ee5\u8fdb\u884c\u989d\u5916\u7684\u9a8c\u8bc1\u3001\u72b6\u6001\u66f4\u65b0\u6216\u8005\u5f02\u6b65\u5904\u7406\uff0c\u518d\u51b3\u5b9a\u662f\u5426\u8ba9\u8868\u5355\u63d0\u4ea4\u3002<\/p>\n<\/p>\n<p><p><strong>\u4e00\u3001\u4f7f\u7528EVENT.PREVENTDEFAULT()<\/strong><\/p>\n<p>JavaScript\u63d0\u4f9b\u4e86<code>Event<\/code>\u5bf9\u8c61\u7684<code>preventDefault()<\/code>\u65b9\u6cd5\u6765\u53d6\u6d88\u4e8b\u4ef6\u7684\u9ed8\u8ba4\u884c\u4e3a\u3002\u5728\u8868\u5355\u63d0\u4ea4\u7684\u4e0a\u4e0b\u6587\u4e2d\uff0c\u963b\u6b62\u9ed8\u8ba4\u884c\u4e3a\u610f\u5473\u7740\u963b\u6b62\u8868\u5355\u6570\u636e\u88ab\u53d1\u9001\u5230\u670d\u52a1\u5668\u4e0a\u7684\u5904\u7406\u9875\u9762\u3002\u8fd9\u53ef\u4ee5\u7528\u4e8e\u8868\u5355\u9a8c\u8bc1\u3001\u901a\u8fc7Ajax\u8fdb\u884c\u63d0\u4ea4\u7b49\u60c5\u51b5\u3002\u5b9e\u73b0\u8fd9\u4e00\u529f\u80fd\uff0c\u901a\u5e38\u5728\u8868\u5355\u7684<code>submit<\/code>\u4e8b\u4ef6\u4e0a\u7ed1\u5b9a\u4e00\u4e2a\u4e8b\u4ef6\u5904\u7406\u51fd\u6570\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-javascript\">document.getElementById(&#039;myForm&#039;).addEventListener(&#039;submit&#039;, function(event){<\/p>\n<p>    \/\/ \u963b\u6b62\u8868\u5355\u9ed8\u8ba4\u63d0\u4ea4\u884c\u4e3a<\/p>\n<p>    event.preventDefault();<\/p>\n<p>    \/\/ \u8fd9\u91cc\u53ef\u4ee5\u52a0\u5165\u8868\u5355\u9a8c\u8bc1\u903b\u8f91<\/p>\n<p>    \/\/ ...<\/p>\n<p>});<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u5728\u8fd9\u4e2a\u51fd\u6570\u4e2d\uff0c<code>event.preventDefault()<\/code>\u88ab\u8c03\u7528\uff0c\u8868\u5355\u63d0\u4ea4\u5c06\u88ab\u963b\u6b62\uff0c\u76f4\u5230\u6211\u4eec\u8fdb\u884c\u9a8c\u8bc1\u6216\u8005\u5176\u4ed6\u4e1a\u52a1\u5904\u7406\u540e\uff0c\u53ef\u4ee5\u901a\u8fc7JavaScript\u52a8\u6001\u89e6\u53d1\u8868\u5355\u7684\u63d0\u4ea4\u3002<\/p>\n<\/p>\n<p><p><strong>\u4e8c\u3001RETURN FALSE IN ONSUBMIT<\/strong><\/p>\n<p>\u5728HTML\u6807\u8bb0\u4e2d\uff0c<code>onsubmit<\/code>\u5c5e\u6027\u53ef\u4ee5\u7528\u6765\u5904\u7406\u8868\u5355\u63d0\u4ea4\u4e8b\u4ef6\u3002\u8fd4\u56de<code>false<\/code>\u53ef\u4ee5\u963b\u6b62\u8868\u5355\u63d0\u4ea4\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-html\">&lt;form id=&quot;myForm&quot; onsubmit=&quot;return validateForm();&quot;&gt;<\/p>\n<p>    &lt;!-- \u8868\u5355\u5143\u7d20 --&gt;<\/p>\n<p>&lt;\/form&gt;<\/p>\n<p>&lt;script&gt;<\/p>\n<p>function validateForm() {<\/p>\n<p>    \/\/ \u8fdb\u884c\u9a8c\u8bc1<\/p>\n<p>    \/\/ \u5982\u679c\u9a8c\u8bc1\u5931\u8d25\u8fd4\u56defalse<\/p>\n<p>    return false;<\/p>\n<p>}<\/p>\n<p>&lt;\/script&gt;<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u5f53<code>validateForm<\/code>\u51fd\u6570\u8fd4\u56de<code>false<\/code>\u65f6\uff0c\u8868\u5355\u63d0\u4ea4\u88ab\u963b\u6b62\u3002\u4f46\u73b0\u4ee3JavaScript\u5f00\u53d1\u4e2d\uff0c\u5c3d\u91cf\u907f\u514d\u5728HTML\u4e2d\u76f4\u63a5\u5199JS\u4ee3\u7801\uff0c\u4fdd\u6301\u5185\u5bb9\u4e0e\u884c\u4e3a\u7684\u5206\u79bb\u539f\u5219\u3002<\/p>\n<\/p>\n<p><p><strong>\u4e09\u3001\u4f7f\u7528ADDEVENTLISTENER<\/strong><\/p>\n<p>\u4f7f\u7528<code>addEventListener<\/code>\u7ed1\u5b9a\u4e8b\u4ef6\u662f\u4e00\u79cd\u66f4\u52a0\u7075\u6d3b\u7684\u65b9\u5f0f\u6765\u63a7\u5236\u4e8b\u4ef6\u7684\u5904\u7406\uff0c\u4e0eHTML\u6807\u8bb0\u5206\u79bb\uff0c\u5e76\u4e14\u53ef\u4ee5\u6dfb\u52a0\u591a\u4e2a\u4e8b\u4ef6\u76d1\u542c\u5668\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-javascript\">document.getElementById(&#039;myForm&#039;).addEventListener(&#039;submit&#039;, function(event){<\/p>\n<p>    if (!validateForm()) {<\/p>\n<p>        \/\/ \u5982\u679c\u9a8c\u8bc1\u5931\u8d25\uff0c\u963b\u6b62\u8868\u5355\u7684\u63d0\u4ea4<\/p>\n<p>        event.preventDefault();<\/p>\n<p>    }<\/p>\n<p>});<\/p>\n<p>function validateForm() {<\/p>\n<p>    \/\/ \u8868\u5355\u9a8c\u8bc1\u903b\u8f91<\/p>\n<p>    \/\/ \u5982\u679c\u9a8c\u8bc1\u901a\u8fc7\u8fd4\u56detrue\uff0c\u5426\u5219\u8fd4\u56defalse<\/p>\n<p>}<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u8fd9\u79cd\u65b9\u6cd5\u7684\u4f18\u52bf\u5728\u4e8e\u53ef\u4ee5\u6ce8\u518c\u591a\u4e2a\u76d1\u542c\u5668\uff0c\u5904\u7406\u66f4\u590d\u6742\u7684\u903b\u8f91\uff0c\u5e76\u4e14\u7ef4\u62a4\u548c\u6d4b\u8bd5\u8d77\u6765\u4e5f\u66f4\u5bb9\u6613\u3002<\/p>\n<\/p>\n<p><p><strong>\u56db\u3001AJAX SUBMISSION<\/strong><\/p>\n<p>\u5728Web\u5e94\u7528\u7a0b\u5e8f\u4e2d\uff0c\u6709\u65f6\u5019\u6211\u4eec\u5e0c\u671b\u901a\u8fc7Ajax\u63d0\u4ea4\u8868\u5355\uff0c\u4ee5\u514d\u9875\u9762\u8df3\u8f6c\u3002\u8fd9\u4e5f\u9700\u8981\u963b\u6b62\u8868\u5355\u7684\u9ed8\u8ba4\u63d0\u4ea4\u884c\u4e3a\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-javascript\">document.getElementById(&#039;myForm&#039;).addEventListener(&#039;submit&#039;, function(event){<\/p>\n<p>    \/\/ \u963b\u6b62\u9ed8\u8ba4\u63d0\u4ea4<\/p>\n<p>    event.preventDefault();<\/p>\n<p>    \/\/ \u521b\u5efa\u4e00\u4e2a FormData \u5bf9\u8c61<\/p>\n<p>    var formData = new FormData(this);<\/p>\n<p>    \/\/ \u4f7f\u7528 fetch \u53d1\u9001\u6570\u636e\u5230\u670d\u52a1\u5668<\/p>\n<p>    fetch(&#039;process.php&#039;, {<\/p>\n<p>        method: &#039;POST&#039;,<\/p>\n<p>        body: formData<\/p>\n<p>    }).then(function(response) {<\/p>\n<p>        return response.text();<\/p>\n<p>    }).then(function(body) {<\/p>\n<p>        \/\/ \u5904\u7406\u670d\u52a1\u5668\u8fd4\u56de\u7684\u5185\u5bb9<\/p>\n<p>        console.log(body);<\/p>\n<p>    });<\/p>\n<p>});<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u521b\u5efa\u4e86\u4e00\u4e2a\u65b0\u7684<code>FormData<\/code>\u5bf9\u8c61\uff0c\u5e76\u901a\u8fc7<code>fetch<\/code> API\u53d1\u9001\u4e86\u5f02\u6b65\u8bf7\u6c42\u3002\u670d\u52a1\u5668\u8fd4\u56de\u7684\u54cd\u5e94\u53ef\u4ee5\u5728FETCH\u4e4b\u540e\u7684\u94fe\u5f0f\u8c03\u7528\u4e2d\u88ab\u5904\u7406\u3002<\/p>\n<\/p>\n<p><p><strong>\u4e94\u3001PRACTICAL EXAMPLES AND BEST PRACTICES<\/strong><\/p>\n<p>\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u6211\u4eec\u901a\u5e38\u7ed3\u5408\u9a8c\u8bc1\u5e93\u548c\u4e00\u4e9b\u6700\u4f73\u5b9e\u8df5\u6765\u5b9e\u73b0\u8868\u5355\u7684\u529f\u80fd\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-javascript\">\/\/ \u7ed1\u5b9a\u63d0\u4ea4\u4e8b\u4ef6\u76d1\u542c\u5668<\/p>\n<p>document.getElementById(&#039;myForm&#039;).addEventListener(&#039;submit&#039;, function(event){<\/p>\n<p>    \/\/ \u6267\u884c\u9a8c\u8bc1<\/p>\n<p>    if (!validateForm(this)) {<\/p>\n<p>        event.preventDefault(); \/\/ \u963b\u6b62\u8868\u5355\u63d0\u4ea4<\/p>\n<p>        displayError(); \/\/ \u663e\u793a\u9519\u8bef\u6d88\u606f<\/p>\n<p>    }<\/p>\n<p>});<\/p>\n<p>\/\/ \u9a8c\u8bc1\u8868\u5355\u5b57\u6bb5<\/p>\n<p>function validateForm(form) {<\/p>\n<p>    \/\/ \u9a8c\u8bc1\u903b\u8f91\uff0c\u4f8b\u5982\u662f\u5426\u4e3a\u7a7a\uff0c\u683c\u5f0f\u662f\u5426\u6b63\u786e\u7b49<\/p>\n<p>}<\/p>\n<p>\/\/ \u663e\u793a\u9519\u8bef\u6d88\u606f<\/p>\n<p>function displayError() {<\/p>\n<p>    \/\/ \u66f4\u65b0\u9875\u9762\u4e0a\u7684\u9519\u8bef\u63d0\u793a\u5143\u7d20<\/p>\n<p>}<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u628a\u9a8c\u8bc1\u903b\u8f91\u653e\u5728\u4e00\u4e2a\u51fd\u6570\u4e2d\uff0c\u53ef\u4ee5\u590d\u7528\u548c\u65b9\u4fbf\u6d4b\u8bd5\u3002\u9519\u8bef\u5904\u7406\u51fd\u6570<code>displayError<\/code>\u53ef\u4ee5\u6839\u636e\u9700\u8981\u66f4\u65b0DOM\u5143\u7d20\uff0c\u4ee5\u5411\u7528\u6237\u663e\u793a\u9519\u8bef\u4fe1\u606f\u3002<\/p>\n<\/p>\n<p><p><strong>\u516d\u3001CONCLUSION AND ACCESSIBILITY CONSIDERATIONS<\/strong><\/p>\n<p>\u6700\u540e\uff0c\u6211\u4eec\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u963b\u6b62\u8868\u5355\u63d0\u4ea4\u5e76\u4e0d\u610f\u5473\u7740\u7528\u6237\u4e0d\u9700\u8981\u5f97\u5230\u9002\u5f53\u7684\u53cd\u9988\u3002\u5e94\u5f53\u9075\u5faa\u65e0\u969c\u788d\u89c4\u8303\uff08Accessibility\uff09\uff0c\u786e\u4fdd\u5728\u963b\u6b62\u63d0\u4ea4\u7684\u540c\u65f6\uff0c\u7528\u6237\u660e\u767d\u53d1\u751f\u4e86\u4ec0\u4e48\uff0c\u77e5\u9053\u600e\u6837\u66f4\u6b63\u8868\u5355\u4e2d\u7684\u9519\u8bef\u3002\u8fd9\u5305\u62ec\u4f7f\u7528\u9002\u5f53\u7684ARIA\u89d2\u8272\u548c\u5c5e\u6027\u6765\u6807\u8bc6\u8868\u5355\u9a8c\u8bc1\u7684\u9519\u8bef\uff0c\u5e76\u786e\u4fdd\u9519\u8bef\u6d88\u606f\u5bf9\u5c4f\u5e55\u9605\u8bfb\u5668\u662f\u53ef\u8bbf\u95ee\u7684\u3002<\/p>\n<\/p>\n<h2><strong>\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n<p><strong>\u5982\u4f55\u963b\u6b62JavaScript\u4e2d\u7684\u8868\u5355\u63d0\u4ea4\uff1f<\/strong><\/p>\n<p>\u95ee\u9898\uff1aJavaScript\u4e2d\u5982\u4f55\u53d6\u6d88\u8868\u5355\u63d0\u4ea4\uff1f<\/p>\n<p>\u56de\u7b54\uff1a\u8981\u963b\u6b62\u8868\u5355\u63d0\u4ea4\uff0c\u53ef\u4ee5\u4f7f\u7528JavaScript\u4e2d\u7684preventDefault()\u65b9\u6cd5\u3002\u8fd9\u4e2a\u65b9\u6cd5\u53ef\u4ee5\u53d6\u6d88\u6d4f\u89c8\u5668\u9ed8\u8ba4\u7684\u8868\u5355\u63d0\u4ea4\u64cd\u4f5c\u3002\u5728\u63d0\u4ea4\u4e8b\u4ef6\u7684\u56de\u8c03\u51fd\u6570\u4e2d\uff0c\u53ef\u4ee5\u8c03\u7528event.preventDefault()\u6765\u963b\u6b62\u8868\u5355\u7684\u63d0\u4ea4\u3002<\/p>\n<p>\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<pre><code class=\"language-javascript\">document.querySelector(&#039;form&#039;).addEventListener(&#039;submit&#039;, function(event) {\n  event.preventDefault(); \/\/ \u963b\u6b62\u8868\u5355\u63d0\u4ea4\n  \/\/ \u5176\u4ed6\u7684\u8868\u5355\u5904\u7406\u903b\u8f91\n});\n<\/code><\/pre>\n<p>\u8fd9\u6837\uff0c\u5f53\u7528\u6237\u70b9\u51fb\u63d0\u4ea4\u6309\u94ae\u65f6\uff0c\u8868\u5355\u5c06\u4e0d\u4f1a\u88ab\u771f\u6b63\u63d0\u4ea4\u5230\u670d\u52a1\u5668\u3002<\/p>\n<p>\u6ce8\u610f\uff1a\u5728\u8c03\u7528preventDefault()\u65b9\u6cd5\u4e4b\u540e\uff0c\u53ef\u4ee5\u6839\u636e\u9700\u8981\u6267\u884c\u5176\u4ed6\u7684\u8868\u5355\u5904\u7406\u903b\u8f91\uff0c\u6bd4\u5982\u8868\u5355\u9a8c\u8bc1\u3001\u6570\u636e\u5904\u7406\u7b49\u64cd\u4f5c\u3002<\/p>\n<p><strong>\u600e\u6837\u4f7f\u7528JavaScript\u4ee3\u7801\u6765\u53d6\u6d88\u8868\u5355\u7684\u63d0\u4ea4\uff1f<\/strong><\/p>\n<p>\u95ee\u9898\uff1a\u5982\u679c\u6211\u60f3\u901a\u8fc7JavaScript\u4ee3\u7801\u6765\u53d6\u6d88\u8868\u5355\u7684\u63d0\u4ea4\uff0c\u5e94\u8be5\u600e\u4e48\u505a\uff1f<\/p>\n<p>\u56de\u7b54\uff1a\u8981\u963b\u6b62\u8868\u5355\u63d0\u4ea4\uff0c\u53ef\u4ee5\u4f7f\u7528JavaScript\u4e2d\u7684\u4e00\u4e2a\u4e8b\u4ef6\u5bf9\u8c61\u7684\u65b9\u6cd5\uff0c\u5373preventDefault()\u3002\u8fd9\u4e2a\u65b9\u6cd5\u4f1a\u963b\u6b62\u6d4f\u89c8\u5668\u7684\u9ed8\u8ba4\u884c\u4e3a\uff0c\u5305\u62ec\u8868\u5355\u7684\u63d0\u4ea4\u3002\u5728\u89e6\u53d1\u8868\u5355\u63d0\u4ea4\u4e8b\u4ef6\u7684\u56de\u8c03\u51fd\u6570\u4e2d\uff0c\u53ef\u4ee5\u8c03\u7528\u8be5\u65b9\u6cd5\u6765\u963b\u6b62\u8868\u5355\u7684\u63d0\u4ea4\u64cd\u4f5c\u3002<\/p>\n<p>\u4e0b\u9762\u662f\u4e00\u4e2a\u793a\u4f8b\u4ee3\u7801\uff1a<\/p>\n<pre><code class=\"language-javascript\">document.getElementById(&#039;myForm&#039;).addEventListener(&#039;submit&#039;, function(event) {\n  event.preventDefault(); 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