jqm源码之propExists
jqm源码系列之propExists
//创建的一个body的jQuery对象
var fakeBody = $("<body>").prependTo("html"),
//body的style对象
fbCSS = fakeBody[0].style,
vendors = ["Webkit","Moz","O"];
/*
* @name propExists
* @param prop
* @info 判断给定的参数是否支持，其实比较的是body对象的style对象是否含有
*/
function propExists(prop){
//假设prop为boxShadow,uc_prop就为BoxShadow
var uc_prop = prop.charAt(0).toUpperCase() + prop.substr(1),
//vendors.join(uc_prop + " ") 返回的是"WebkitBoxShadow MozBoxShadow O"
//props为["boxShadow","WebkitBoxShadow","MozBoxShadow","OBoxShadow","BoxShadow"]
props = (prop + " " + vendors.join(uc_prop + " ") + uc_prop).split("");
//v从0开始，props是一个长度为4的数组
for(var v in props){
//有就返回true
if(fbCSS[props[v]] !== undefined){
return true;
}
}
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