Object.length undefined in javascript | js string length undefined
ThatsbecausecoordinatesisObjectnotArray,usefor..in[1]varcoordinates={"a":[[1,2],[8,9],[3,5],[6,1]],"b":[[5,8],[2,4],[6,8],[1,9]]};for(variincoordinates){console.log(coordinates[i])}orObject.keys[2]varcoordinates={"a":[[1,2],[8,9],[3,5],[6,1]],"b":[[5,8],[2,4],[6,8],[1,9]]};varkeys=Object.keys(coordinates);for(vari=0,len=keys.length;i
Thats because coordinates is Object not Array, use for..in[1]
var coordinates = { "a": [ [1, 2], [8, 9], [3, 5], [6, 1] ], "b": [ [5, 8], [2, 4], [6, 8], [1, 9] ] }; for (var i in coordinates) { console.log(coordinates[i]) }or Object.keys[2]
var coordinates = { "a": [ [1, 2], [8, 9], [3, 5], [6, 1] ], "b": [ [5, 8], [2, 4], [6, 8], [1, 9] ] }; var keys = Object.keys(coordinates); for (var i = 0, len = keys.length; i < len; i++) { console.log(coordinates[keys[i]]); } References for..in (developer.mozilla.org) Object.keys (developer.mozilla.org)取得本站獨家住宿推薦 15%OFF 訂房優惠
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... (var i = 0, len = keys.length; i < len; i++) console.log(coordinates[keys[i]]); } ... "a string - length is the number of characters".length ['an array', ... Read More
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