為什么賦值一個之后不會輸出了
<script language="javascript">
?var mynum=new Array(65,90,88,98);
?var ?mynum[12]=87;
?document.write("數組的長度是:"+ ?mynum.length );
</script>
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<script language="javascript">
?var mynum=new Array(65,90,88,98);
?var ?mynum[12]=87;
?document.write("數組的長度是:"+ ?mynum.length );
</script>
2017-02-19
舉報
2017-02-19
var ?mynum[12]=87; var要去掉吧 又聲明個變量？
2017-02-19
<script language="javascript">
?var mynum=new Array(65,90,88,98);
?mynum[12]=87;
?document.write("數組的長度是:"+ ?mynum.length );
</script>
樓上說得對!