使用javascript实现html文字不可选

如何使用js让html该文本是不可选定它?首先想到的是用css选择实现,如下面:

-webkit-touch-callout: none;
-webkit-user-select: none;
-khtml-user-select: none;
-moz-user-select: none;
-ms-user-select: none;
user-select: none;

可是这样并不能兼容旧的浏览器,所下面本文将讨论怎样使用js来实现。并兼容全部浏览器。

首先想到的是:

<!doctype html>
<html lang="en">
<head>
<title>SO question 2310734</title>
<script>
window.onload = function() {
var labels = document.getElementsByTagName('label');
for (var i = 0; i < labels.length; i++) {
disableSelection(labels[i]);
}
};
function disableSelection(element) {
if (typeof element.onselectstart != 'undefined') {
element.onselectstart = function() { return false; };
} else if (typeof element.style.MozUserSelect != 'undefined') {
element.style.MozUserSelect = 'none';
} else {
element.onmousedown = function() { return false; };
}
}
</script>
</head>
<body>
<label>Try to select this</label>
</body>
</html>

这样就能够完毕html文本不可选了,假设你在使用jQuery也能够扩展JQuery插件的方式来实现:

<!doctype html>
<html lang="en">
<head>
<title>SO question 2310734 with jQuery</title>
<script src="http://code.jquery.com/jquery-latest.min.js"></script>
<script>
$.fn.extend({
disableSelection: function() {
this.each(function() {
if (typeof this.onselectstart != 'undefined') {
this.onselectstart = function() { return false; };
} else if (typeof this.style.MozUserSelect != 'undefined') {
this.style.MozUserSelect = 'none';
} else {
this.onmousedown = function() { return false; };
}
});
}
}); $(document).ready(function() {
$('label').disableSelection();
});
</script>
</head>
<body>
<label>Try to select this</label>
</body>
</html>

或者:

(function ($) {
$.fn.disableSelection = function () {
return this.each(function () {
if (typeof this.onselectstart != 'undefined') {
this.onselectstart = function() { return false; };
} else if (typeof this.style.MozUserSelect != 'undefined') {
this.style.MozUserSelect = 'none';
} else {
this.onmousedown = function() { return false; };
}
});
};
})(jQuery); $(document).ready(function() {
$('label').disableSelection(); // Or to make everything unselectable
$('*').disableSelection();
});

行,这可以与所有的浏览器基本相容。

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