最近用到了根據經緯度計算地球表面兩點間距離的公式,然後就用JS實現了一下。計算地球表面兩點間的距離大概有兩種辦法。第一種是預設地球是一個光滑的球面,然後計算任意兩點間的距離,這個距離叫做大圓距離(The Great Circle Distance)。公式如下:使用JS來實現為:var EARTH_RADIUS = 6378137.0; //單位M var PI = Math.PI; function getRad(d){ return d*PI/180.0
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Judge current user permissionsometime, we should judge the permisson of current user when view different page. here, we can complete it via js, follow the code.For example: the permission site center includes different permission groups, here we
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var myDate = new Date();myDate.getYear(); //擷取當前年份(2位)myDate.getFullYear(); //擷取完整的年份(4位,1970-????)myDate.getMonth(); //擷取當前月份(0-11,0代表1月)myDate.getDate(); //擷取當前日(1-31)myDate.getDay();