我想从这里使用Kangax的脚本:http://kangax.github.com/cft/来检测那些“正常”实现位置的浏览器:与移动浏览器相比,这是固定的,因为我可以使用jQuery来伪装它移动浏览器。检测位置:使用javascript固定
Kangax的代码工作正常。但是,当我将它合并到我的页面时,它不会。我认为这肯定是一个明显的错误。任何帮助将非常感激!
////Detect whether position:fixed works (mobile browsers). Use JS to position #navwrap if not.
//Kangax's script - begins at "function" on the next line.
function detected() {
var container = document.body;
if (document.createElement &&
container && container.appendChild && container.removeChild) {
var el = document.createElement("div");
if (!el.getBoundingClientRect) {
return null;
}
el.innerHTML = "x";
el.style.cssText = "position:fixed;top:100px;";
container.appendChild(el);
var originalHeight = container.style.height, originalScrollTop = container.scrollTop;
container.style.height = "3000px";
container.scrollTop = 500;
var elementTop = el.getBoundingClientRect().top;
container.style.height = originalHeight;
var isSupported = elementTop === 100;
container.removeChild(el);
container.scrollTop = originalScrollTop;
return isSupported;
}
return null;
};
if (detected()) {
alert ('non-mobile');
}
else {
alert ('mobile');
}
万一有帮助,原代码(剥离尽可能多地):
<body>
<h2>Position Fixed Test</h2>
<script>
(function(__global){
// make sure `window` resolves to a global object
var window = this;
var features = { };
features.IS_POSITION_FIXED_SUPPORTED = (features.__IS_POSITION_FIXED_SUPPORTED = function() {
var container = document.body;
if (document.createElement &&
container && container.appendChild && container.removeChild) {
var el = document.createElement("div");
if (!el.getBoundingClientRect) {
return null;
}
el.innerHTML = "x";
el.style.cssText = "position:fixed;top:100px;";
container.appendChild(el);
var originalHeight = container.style.height, originalScrollTop = container.scrollTop;
container.style.height = "3000px";
container.scrollTop = 500;
var elementTop = el.getBoundingClientRect().top;
container.style.height = originalHeight;
var isSupported = elementTop === 100;
container.removeChild(el);
container.scrollTop = originalScrollTop;
return isSupported;
}
return null;
})();
__global.__features = features;
})(this);
(function(){
function detect() {
for (var i=0; i<1; i++) {
var testResult = __features['IS_POSITION_FIXED_SUPPORTED'];
alert (testResult);
i++;
}
};
detect();
})();
</script>
</body>
什么是错误 – shevski 2011-05-10 11:02:03
http://kangax.github.com/cft/上的原始示例可以成功地区分桌面和移动浏览器,但我的不是。我想我没有测试null与isSupported正确? – phil 2011-05-10 12:38:41
你看到什么,什么时候 – shevski 2011-05-10 12:45:04