一、首先安装codeMirror的依赖js和css，顺便引入jQuery包。
<link rel="stylesheet" href="codemirror-5.31.0/lib/codemirror.css">
<script src="jquery.1.11.min.js"></script>
<script src="codemirror-5.31.0/lib/codemirror.js"></script>
二、由于json属于JavaScript的一种，所以也得引入JavaScript。
<script src="codemirror-5.31.0/mode/javascript/javascript.js"></script>
三、安装一些需要的样式，比如我引入的如下样式，其实可以自己选择引入，也可以不引入。
<!--引入js，绑定Vim--> <script src="codemirror-5.31.0/keymap/vim.js"></script> <!--引入css文件，用以支持主题--> <link rel="stylesheet" href="codemirror-5.31.0/theme/eclipse.css">
四、body代码，编辑器就是textarea，可自定义样式，在head中引入即可。
<body> <textarea id="code"></textarea> </body>
五、最重要的就在头部引用以下代码，表示json格式化。
<!--格式化--> <script src="codemirror-5.31.0/lib/formatting.js"></script>
我是将自定义的格式化代码存到了codeMirror的lib下新建了一个formatting.js，以下是我新建的js的源码。
(function() {
CodeMirror.extendMode("css", {
commentStart: "/*",
commentEnd: "*/",
newlineAfterToken: function(type, content) {
return /^[;{}]$/.test(content);
}
});
CodeMirror.extendMode("javascript", {
commentStart: "/*",
commentEnd: "*/",
// FIXME semicolons inside of for
newlineAfterToken: function(type, content, textAfter, state) {
if (this.jsonMode) {
return /^[\[,{]$/.test(content) || /^}/.test(textAfter);
} else {
if (content == ";" && state.lexical && state.lexical.type == ")") return false;
return /^[;{}]$/.test(content) && !/^;/.test(textAfter);
}
}
});
CodeMirror.extendMode("xml", {
commentStart: "<!--",
commentEnd: "-->",
newlineAfterToken: function(type, content, textAfter) {
return type == "tag" && />$/.test(content) || /^</.test(textAfter);
}
});
// Comment/uncomment the specified range
CodeMirror.defineExtension("commentRange", function (isComment, from, to) {
var cm = this, curMode = CodeMirror.innerMode(cm.getMode(), cm.getTokenAt(from).state).mode;
cm.operation(function() {
if (isComment) { // Comment range
cm.replaceRange(curMode.commentEnd, to);
cm.replaceRange(curMode.commentStart, from);
if (from.line == to.line && from.ch == to.ch) // An empty comment inserted - put cursor inside
cm.setCursor(from.line, from.ch + curMode.commentStart.length);
} else { // Uncomment range
var selText = cm.getRange(from, to);
var startIndex = selText.indexOf(curMode.commentStart);
var endIndex = selText.lastIndexOf(curMode.commentEnd);
if (startIndex > -1 && endIndex > -1 && endIndex > startIndex) {
// Take string till comment start
selText = selText.substr(0, startIndex)
// From comment start till comment end
+ selText.substring(startIndex + curMode.commentStart.length, endIndex)
// From comment end till string end
+ selText.substr(endIndex + curMode.commentEnd.length);
}
cm.replaceRange(selText, from, to);
}
});
});
// Applies automatic mode-aware indentation to the specified range
CodeMirror.defineExtension("autoIndentRange", function (from, to) {
var cmInstance = this;
this.operation(function () {
for (var i = from.line; i <= to.line; i++) {
cmInstance.indentLine(i, "smart");
}
});
});
// Applies automatic formatting to the specified range
CodeMirror.defineExtension("autoFormatRange", function (from, to) {
var cm = this;
var outer = cm.getMode(), text = cm.getRange(from, to).split("\n");
var state = CodeMirror.copyState(outer, cm.getTokenAt(from).state);
var tabSize = cm.getOption("tabSize");
var out = "", lines = 0, atSol = from.ch == 0;
function newline() {
out += "\n";
atSol = true;
++lines;
}
for (var i = 0; i < text.length; ++i) {
var stream = new CodeMirror.StringStream(text[i], tabSize);
while (!stream.eol()) {
var inner = CodeMirror.innerMode(outer, state);
var style = outer.token(stream, state), cur = stream.current();
stream.start = stream.pos;
if (!atSol || /\S/.test(cur)) {
out += cur;
atSol = false;
}
if (!atSol && inner.mode.newlineAfterToken &&
inner.mode.newlineAfterToken(style, cur, stream.string.slice(stream.pos) || text[i+1] || "", inner.state))
newline();
}
if (!stream.pos && outer.blankLine) outer.blankLine(state);
if (!atSol) newline();
}
cm.operation(function () {
cm.replaceRange(out, from, to);
for (var cur = from.line + 1, end = from.line + lines; cur <= end; ++cur)
cm.indentLine(cur, "smart");
cm.setSelection(from, cm.getCursor(false));
});
});
})();
六、使用方法
使用方式是在html页面中的JavaScript中写入以下代码：
<script type="text/javascript">
var editor=CodeMirror.fromTextArea(document.getElementById("code"),{
//Js高亮显示
mode:"application/json",
//设置主题
theme:"eclipse",
//快捷键
extraKeys:{
"F7": function autoFormat(editor) {
var totalLines = editor.lineCount();
editor.autoFormatRange({line:0, ch:0}, {line:totalLines});
}//代码格式化
},
});
</script>
运行项目，写入json格式代码，点击F7就可实现对代码的格式化
