Uncaught TypeError: sum is not a function
2016-10-11 16:50
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<pre name="code" class="javascript"><span style="color: rgb(51, 51, 51); font-size: 13px; line-height: 20.02px; font-family: Arial, Helvetica, sans-serif;">function sum(x,y) </span><span style="color: rgb(51, 51, 51); font-family: Arial, Helvetica, sans-serif; font-size: 13px; line-height: 20.02px;">{</span>
<span style="color: rgb(51, 51, 51); font-family: Arial, Helvetica, sans-serif; font-size: 13px; line-height: 20.02px;"> sum = x + y; </span>
<span style="color: rgb(51, 51, 51); font-family: Arial, Helvetica, sans-serif; font-size: 13px; line-height: 20.02px;"> document.write(sum+"<br/>");</span>
<span style="color: rgb(51, 51, 51); font-family: Arial, Helvetica, sans-serif; font-size: 13px; line-height: 20.02px;">}</span>
<span style="color: rgb(51, 51, 51); font-family: Arial, Helvetica, sans-serif; font-size: 13px; line-height: 20.02px;">sum(1,2);</span>
<span style="color: rgb(51, 51, 51); font-family: Arial, Helvetica, sans-serif; font-size: 13px; line-height: 20.02px;">sum(3,4);</span>
报错:Uncaught TypeError: sum is not a function
原因:变量和函数同名,导致歧义
改为:
</pre><pre name="code" class="javascript"><pre name="code" class="javascript">function sum(x,y) {
all = x + y;
document.write(all+"<br/>");
}
<pre name="code" class="javascript">sum(1,2); sum(3,4);
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